Lite toolchains don't include support for native libraries and thus
-msgxx-glibc is not a valid option. Added a check to see if the tools contain
a license directory to determine whether a pro (true) or lite (false)
toolchain is being used and set TUNE_CCARGS_append_x86 accordingly.
Tested with both Lite and pro toolchains.
Signed-off-by: Michael Powell <michael_powell@mentor.com>