iOS buildfix.

GPU/GLES/TextureCache.cpp

@@ -44,6 +44,10 @@
 // Try to be prime to other decimation intervals.
 #define TEXCACHE_DECIMATION_INTERVAL 13
 
+#ifndef GL_UNPACK_ROW_LENGTH
+#define GL_UNPACK_ROW_LENGTH 0x0CF2
+#endif
+
 extern int g_iNumVideos;
 
 TextureCache::TextureCache() : clearCacheNextFrame_(false), lowMemoryMode_(false), clutBuf_(NULL) {