Replace manual gcc version check by AV_GCC_VERSION_AT_LEAST macro.

Originally committed as revision 29701 to svn://svn.mplayerhq.hu/mplayer/trunk/libswscale

libswscale/swscale_template.c

@@ -2496,7 +2496,7 @@ inline static void RENAME(hcscale)(SwsContext *c, uint16_t *dst, long dstWidth,
 
 /* GCC 3.3 makes MPlayer crash on IA-32 machines when using "g" operand here,
    which is needed to support GCC 4.0. */
-#if ARCH_X86_64 && ((__GNUC__ > 3) || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4))
+#if ARCH_X86_64 && AV_GCC_VERSION_AT_LEAST(3,4)
                 :: "m" (src1), "m" (dst), "g" (dstWidth), "m" (xInc_shr16), "m" (xInc_mask),
 #else
                 :: "m" (src1), "m" (dst), "m" (dstWidth), "m" (xInc_shr16), "m" (xInc_mask),