Changes

Make gluegen output messages more informative

Remove unused file cl_render_ext.h
This originally held definitions that hadn't been finalized before the 
release of OpenGL 1.1, but later those were put in the normal set of 
header files, making this file redundant.

Upgrade OpenCL headers to standard Khronos version 1.1
They were previously a pre-release version of 1.1 that had some manual 
changes and upgrades. This moves to the canonical versions downloaded 
from khronos.org.

Remove copy of generated Java files to build-temp directory
This build step doesn't seem to be needed; can just read the files where 
they're created in the build directory and everything works the same.

Add OpenCL 1.2 and 2.0 headers and CLImpl classes
Added stub includes for OpenCL 1.2 and 2.0. Added new CLImpl versions
for 1.2 and 2.0 to the build, but left them unused for now. The CL
bindings used by JOCL are still generated from OpenCL 1.1, so the
existing Java code will be able to stay mostly unchanged in the future.

Add explicit version number to original CL impl classes.
This makes all three versions (1.1, 1.2, and 2.0) use the same naming 
convention, and sets me up to use the unversioned name to factor out 
code common to all three.

Factor out common custom C and Java code to reduce duplication
Consolidated C custom code so common functions are only defined once in 
the 1.1 version, then are called from the 1.2 and 2.0 version. Pulled 
common code in CLImpl up into the autogenerated implementation class and 
removed the hand-written implementation (since it was left empty). 
Factored custom Java code out so there was as little duplication as 
possible across the three CLImpl versions, with common code for all 
three versions in clImplCustomCode.java.

Add ability to access newer CLImpl versions for devices
Added a CLPlatform method to return a CLImpl version specific to a 
device. This lets the user get a CLImpl12 or CLImpl20 instance which 
they could then cast to the right type and use to access newer CL 
functions than those in the default CLImpl11 object.

Remove use of CL*Binding interfaces
In preparation for removing the interfaces themselves

Remove creation and all references to CL*Binding interfaces
This completes the removal of all CL*Binding interfaces; all tests pass 
at this point.

Remove CLGL interface
This removes the last sub-interface that would have to be separately 
versioned for future versions of OpenCL. After this, new OpenCL versions 
will only create one new interface and one new implementation.

Add versioned interfaces for CL 1.1, 1.2, and 2.0
Now all three derive from CL, which is currently 1.1.

Replace erroneous tabs with spaces.

Remove unused stuff from build.xml
Removed header file downloader task which was no longer used (and not 
really possible to use, given the amount of manual tweaking needed to 
get gluegen to run on a new set of header files). Removed some 
commented-out lines that were obsolete. Fixed some formatting. Removed 
some ARMv6-related stuff that made no sense for JOCL (was inherited from 
JOAL). Added some forgotten dependency paths.

Fix generated files dependency check; remove unused include paths
Fixed the dependency check for generated files; previously we were 
looking at the wrong path, and always regenerating all files. Also 
removed some include paths that don't contain any files, and renamed 
some filesets so it's more clear what they contain.

Fix CLProgram build lock to work on Intel OpenCL implementation
The Intel OpenCL implementation calls the clBuildProgram notify function 
on a different thread, so had to change a reentrant lock to a semaphore 
to allow this.

Fix CLProgramTest for Intel OpenCL
Added a couple of differences in test results for programs recreated 
from binaries (the programs are executable and have binary length > 0), 
and avoided the CL kernel creation test on a binary because it segfaults 
like it does on AMD drivers.

Fix command queue test for Intel
User events start as CL_SUBMITTED instead of CL_QUEUE on Intel.

Fix compilation of OpenCL 2.x headers on OS X
The include files were getting the OS X framework files from OpenCL/*.h, 
instead of the local stub files from CL/*.h, which meant that OpenCL 
2.x-related things were undefined. Changed OpenCL 2.x stub files to 
refer to local .h files only. Maybe later change 1.x also, but leaving 
it for now to minimize disruption to working code.

Fix OS X 32-bit builds for OpenCL 1.2 and 2.0
Copies changes from Sven's commit
f7c50fca34df0b5d393ffab0da09bce19ddfba64 into the two new config files
for OpenCL 1.2 and 2.0, so the fix will be present in all three
versions.

Bug 1268: Adapt to GlueGen commit
2034bbfac88b7d1360f9c939e173ff758f7f47ac

Bump scripts to jre1.8.0_66