[LPC11U35][GCC_ARM][GCC_CR]: Modificatins for build.
1. Added to the export table in export_test.py.
2. Added to the build table in build_release.py
3. Added the compilation directives to RTX os files.

Notice:
 It would be better to change WORDS_STACK_SIZE definition in libraries/rtos/rtx/cmsis_os.h
 from 512 to 128 for LPC11U35 and LPC1114 micros compiled by GCC toolchain with newlib-nano,
 but I don't know the good way at this moment.
Merge pull request #212 from dinau/lpc11u35_gcc_arm

[LPC11U35][GCC_ARM][GCC_CR]: Modificatins for build.