drop real compilation test, bails out ?

Index: cmake/Modules/CompilerRTUtils.cmake
--- cmake/Modules/CompilerRTUtils.cmake.orig
+++ cmake/Modules/CompilerRTUtils.cmake
@@ -121,7 +121,6 @@ macro(test_target_arch arch def)
       set(CAN_TARGET_${arch} FALSE)
     elseif(TEST_COMPILE_ONLY)
       try_compile_only(CAN_TARGET_${arch}
-                       SOURCE "#include <limits.h>\nint foo(int x, int y) { return x + y; }\n"
                        FLAGS ${TARGET_${arch}_CFLAGS})
     else()
       set(FLAG_NO_EXCEPTIONS "")
