mesa: move fixed function vertex program builder from tnl to core mesa

Also unify caching of fragment and vertex programs in shader/prog_cache.c`

Brought across from gallium-0.2
diff --git a/src/mesa/shader/program.c b/src/mesa/shader/program.c
index 9f9d595..2932c9e 100644
--- a/src/mesa/shader/program.c
+++ b/src/mesa/shader/program.c
@@ -33,6 +33,7 @@
 #include "main/context.h"
 #include "main/hash.h"
 #include "program.h"
+#include "prog_cache.h"
 #include "prog_parameter.h"
 #include "prog_instruction.h"
 
@@ -66,6 +67,7 @@
       ctx->VertexProgram.TrackMatrix[i] = GL_NONE;
       ctx->VertexProgram.TrackMatrixTransform[i] = GL_IDENTITY_NV;
    }
+   ctx->VertexProgram.Cache = _mesa_new_program_cache();
 #endif
 
 #if FEATURE_NV_fragment_program || FEATURE_ARB_fragment_program
@@ -73,8 +75,10 @@
    _mesa_reference_fragprog(ctx, &ctx->FragmentProgram.Current,
                             ctx->Shared->DefaultFragmentProgram);
    assert(ctx->FragmentProgram.Current);
+   ctx->FragmentProgram.Cache = _mesa_new_program_cache();
 #endif
 
+
    /* XXX probably move this stuff */
 #if FEATURE_ATI_fragment_shader
    ctx->ATIFragmentShader.Enabled = GL_FALSE;
@@ -93,9 +97,11 @@
 {
 #if FEATURE_NV_vertex_program || FEATURE_ARB_vertex_program
    _mesa_reference_vertprog(ctx, &ctx->VertexProgram.Current, NULL);
+   _mesa_delete_program_cache(ctx, ctx->VertexProgram.Cache);
 #endif
 #if FEATURE_NV_fragment_program || FEATURE_ARB_fragment_program
    _mesa_reference_fragprog(ctx, &ctx->FragmentProgram.Current, NULL);
+   _mesa_delete_program_cache(ctx, ctx->FragmentProgram.Cache);
 #endif
    /* XXX probably move this stuff */
 #if FEATURE_ATI_fragment_shader