scons: Specify C99 throughout all the tree.

MSVC may not support full C99, but supports more than plain C90. And
-pedantic without -std=c99 generates too many spurious warnings
(specially C++ style comments) to be of any use.

Note that using certain C99 features in the cross-platform parts of Gallium
is still not possible; namely mid-of-scope variable declarations and named
structure initializers will break MSVC builds.

scons/gallium.py

@@ -311,6 +311,7 @@ def generate(env):
             '-Wmissing-prototypes',
             '-Wno-long-long',
             '-ffast-math',
+            '-std=c99',
             '-pedantic',
             '-fmessage-length=0', # be nice to Eclipse
         ]

src/mesa/SConscript

@@ -12,11 +12,6 @@ if env['platform'] != 'winddk':
 		'#/src/mesa',
 	])
 	
-	if gcc:
-		env.Append(CFLAGS = [
-			'-std=c99',
-		])
-
 	#
 	# Source files
 	#
@@ -164,6 +159,7 @@ if env['platform'] != 'winddk':
 		'state_tracker/st_context.c',
 		'state_tracker/st_debug.c',
 		'state_tracker/st_draw.c',
+		'state_tracker/st_draw_feedback.c',
 		'state_tracker/st_extensions.c',
 		'state_tracker/st_format.c',
 		'state_tracker/st_framebuffer.c',