cmake: fix compile problems on pre-GCH support compilers
cmake: fix compile problems on pre-GCH support compilers

Support for GCC 3.x was broken without this.

Signed-off-by: Steven Noonan <4068f0880b399410602d694b3cc711c8a8f4727e@uplinklabs.net>

tycho/crisscross,tycho/crisscross,tycho/crisscross