Fixes #70 Adds necessary define for GCC restrict keyword

source/buildsupport/POSIX/OpENer_PLATFORM_INCLUDES.cmake

@@ -1,6 +1,6 @@
 macro(opener_platform_spec)
   include_directories(${PORTS_SRC_DIR}/${OpENer_PLATFORM} ${PORTS_SRC_DIR}/${OpENer_PLATFORM}/sample_application)
   set( CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=c99 -Werror=implicit-function-declaration" )
-  add_definitions( -D_POSIX_C_SOURCE=200112L -D__USE_GNU -D__USE_XOPEN2K)
+  add_definitions( -D_POSIX_C_SOURCE=200112L -D__USE_GNU -D__USE_XOPEN2K -DRESTRICT=restrict)
 endmacro(opener_platform_spec)