gallivm: remove explicit __STDC_.*_MACROS defines
gallivm: remove explicit __STDC_.*_MACROS defines

Correctly handled by the build systems.

Cc: Roland Scheidegger <7d58aee419d6f9201d75517c885374dff5e7d848@vmware.com>
Signed-off-by: Emil Velikov <f20878473f414da183da19ee25c8722cc1d711e4@collabora.com>
Reviewed-by: Roland Scheidegger <7d58aee419d6f9201d75517c885374dff5e7d848@vmware.com>
Reviewed-by: Eric Engestrom <de0b63cf2dfb1fae8ed3c3b4244856a05677d4f0@imgtec.com>
Reviewed-by: Jose Fonseca <61b5a29db2c0650f7c8510f93eece059c1b09320@vmware.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler