mesa: Prefix main includes with dir to avoid conflicts.

Eliminate a couple of differences with gallium-0.2

src/mesa/sparc/sparc.c

@@ -31,7 +31,7 @@
 
 #ifdef USE_SPARC_ASM
 
-#include "context.h"
+#include "main/context.h"
 #include "math/m_xform.h"
 #include "tnl/t_context.h"
 

src/mesa/swrast_setup/ss_vb.h

@@ -29,7 +29,7 @@
 #ifndef SS_VB_H
 #define SS_VB_H
 
-#include "mtypes.h"
+#include "main/mtypes.h"
 #include "swrast_setup.h"
 
 void _swsetup_vb_init( GLcontext *ctx );

src/mesa/x86-64/x86-64.c

@@ -31,8 +31,8 @@
 
 #ifdef USE_X86_64_ASM
 
-#include "glheader.h"
-#include "context.h"
+#include "main/glheader.h"
+#include "main/context.h"
 #include "math/m_xform.h"
 #include "tnl/t_context.h"
 #include "x86-64.h"