Changes

Bug 1190: Updating crosstools and enabling aarch64 + armv6hf 'ontarget'
Default is to crosscompile w/o testing, i.e. property
'isCrosscompilation' is set to 'true'.
'ontarget' includes testing, no crosscompilation.
Updated crosstools links to new build of jogamp-scripting commit
e6692024687685d3af725555d9bb5490d85ecc8d

Bug 1190: Fix arm6hf + aarch64 gcc options, adapt glibc-compat-symbols.h
- arm6hf needs the fpu to be specified, we still use the lowest armv6
hard float denominator
- aarch64 shall have the -march compiler argument as well
- glibc-compat-symbols.h Finally drop the glibc versioning on memcpy for
both

Bug 1190: aarch64 + armhf ld symbolic link to actual x-tool binary of
ld.bfd

Bug 1190: Define TARGET_PLATFORM_SYSROOT TARGET_PLATFORM_USRROOT
TARGET_PLATFORM_USRLIBS for crosscompilation
Android Crosscompilation Usage:
- TARGET_PLATFORM_ROOT -> TARGET_PLATFORM_SYSROOT
General
- TARGET_PLATFORM_SYSROOT Crosscompiler and system specified 'sysroot'
(as in gcc --print-sysroot)
- TARGET_PLATFORM_USRROOT Additional optional user headers and libraries
for target
- TARGET_PLATFORM_USRLIBS Actual location of target user libraries
within TARGET_PLATFORM_USRROOT
- TARGET_JAVA_LIBS Actual location of the Java libraries within
TARGET_PLATFORM_USRROOT

Complete jogamp-env.xml TARGET_* readout; Use parsed env in
cpptasks-base as well