Revert "st/mesa: get Version from gl_program rather than gl_shader_program"
Revert "st/mesa: get Version from gl_program rather than gl_shader_program"

This reverts commit 6bf63b011992dbbc899a28bde5692070dbcf965a.

A patch that adds a reference to gl_shader_program_data to gl_program
needs to land befor this one.

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler