shader_runner: sscanf returns incorrect value on 32-bit build
A number of tests were reporting failure on 32-bit build, due to sscanf incorrectly parsing hexadecimal values of -0.0 and NaN.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=107677
Signed-off-by: Yevhenii Kolesnikov yevhenii.kolesnikov@globallogic.com