Treat unsized RGBA/RGB textures as renderable.

Bug 29770672

Change-Id: I11472a3a1aa5a6e0cd28a846cd182350abd0da89
Reviewed-on: https://swiftshader-review.googlesource.com/5720
Tested-by: Nicolas Capens <capn@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <capn@google.com>

src/OpenGL/libGLES_CM/utilities.cpp

diff --git a/src/OpenGL/libGLES_CM/utilities.cpp b/src/OpenGL/libGLES_CM/utilities.cpp
index b03f15c..b0b110a 100644
--- a/src/OpenGL/libGLES_CM/utilities.cpp
+++ b/src/OpenGL/libGLES_CM/utilities.cpp
@@ -102,6 +102,8 @@
 	{
 		switch(internalformat)
 		{
+		case GL_RGB:
+		case GL_RGBA:
 		case GL_RGBA4_OES:
 		case GL_RGB5_A1_OES:
 		case GL_RGB565_OES: