Changing compiler options

[Ben Cooksley]

Hi all,

Recently build.kde.org ran into some problems with building libkdcraw,
due to CMake using the -std=iso9899:1990 option with GCC.
It seems that this appears to be incompatible with LCMS' use of inline
functions.

The build log can be viewed at
http://build.kde.org/view/FAILED/job/libkdcraw_master/38/console
Changing it out for -std=c99 seems to fix this however - how would one
do this with CMake?

Thanks,
Ben