fix build errors:

SDL_v4l_filters_thomas.c: In function 'MMX_add_sub_shr':
SDL_v4l_filters_thomas.c:50: error: memory input 3 is not directly addressable
SDL_v4l_filters_thomas.c: In function 'yuv420p_to_rgb32':
SDL_v4l_filters_thomas.c:154: error: memory input 4 is not directly addressable
SDL_v4l_filters_thomas.c:154: error: memory input 5 is not directly addressable
SDL_v4l_filters_thomas.c: In function 'yuv420p_to_bgr32':
SDL_v4l_filters_thomas.c:256: error: memory input 4 is not directly addressable
SDL_v4l_filters_thomas.c:256: error: memory input 5 is not directly addressable

filter/Bluebox.c: In function 'Apply':
filter/Bluebox.c:57: error: memory input 2 is not directly addressable

filter/Trashmask.c: In function 'Apply':
filter/Trashmask.c:58: error: memory input 2 is not directly addressable

http://bugs.gentoo.org/152002

--- SDL_v4l_filters_thomas.c
+++ SDL_v4l_filters_thomas.c
@@ -94,7 +94,7 @@
 		: "=m"  (bild)		// %0
 		:"m"    (buf),		// %1
 		 "m"	(summe),	// %2
-		 "m"	(SHIFT),	// %3
+		 "g"	(SHIFT),	// %3
 		 "m"	(len)		// %4
 		);
 	return 1;
@@ -226,8 +226,8 @@
 			:  "m"  (u),		//%1
 			   "m"  (v),		//%2
 			   "m"  (d),		//%3
-			   "m"  (ng_clip),	//%4
-			   "m"	(ng_yuv_g2)	//%5
+			   "g"  (ng_clip),	//%4
+			   "g"	(ng_yuv_g2)	//%5
 				     );
 			d+=8;
 			y+=2; 
@@ -328,8 +328,8 @@
 			:  "m"  (u),		//%1
 			   "m"  (v),		//%2
 			   "m"  (d),		//%3
-			   "m"  (ng_clip),	//%4
-			   "m"	(ng_yuv_g2)	//%5
+			   "g"  (ng_clip),	//%4
+			   "g"	(ng_yuv_g2)	//%5
 				     );
 			d+=8;
 			y+=2; 
--- filter/Bluebox.c
+++ filter/Bluebox.c
@@ -120,7 +120,7 @@
 	"	pop		%%ebx				\n"
 		: "=m"  (buf)		// %0
 		:"m"    (dat),		// %1
-		 "m"	(MASK),		// %2
+		 "g"	(MASK),		// %2
 		 "m"	(len)		// %3
 		);
 	/* }}} */
--- filter/Trashmask.c
+++ filter/Trashmask.c
@@ -96,7 +96,7 @@
 	"	pop		%%ecx			\n"
 		: "=m"  (src)		// %0
 		: "m"	(dst),		// %1 
-		 "m"    (MASK),         // %2
+		 "g"    (MASK),         // %2
 		 "m"	(len)		// %3
 		);
 	/* }}} */