mesa: Make _mesa_init_shader_program static

Since a couple commits ago, there is only one caller, and that caller is
in the same file.

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Brian Paul <brianp@vmware.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
2 files changed