EXT-6276 Put in some gl flush calls to texture state functions.

indra/llrender/llrender.cpp

@@ -387,6 +387,8 @@ void LLTexUnit::setTextureAddressMode(eTextureAddressMode mode)
 {
 	if (mIndex < 0 || mCurrTexture == 0) return;
 
+	gGL.flush();
+
 	activate();
 
 	glTexParameteri (sGLTextureType[mCurrTexType], GL_TEXTURE_WRAP_S, sGLAddressMode[mode]);
@@ -401,6 +403,8 @@ void LLTexUnit::setTextureFilteringOption(LLTexUnit::eTextureFilterOptions optio
 {
 	if (mIndex < 0 || mCurrTexture == 0) return;
 
+	gGL.flush();
+
 	if (option == TFO_POINT)
 	{
 		glTexParameteri(sGLTextureType[mCurrTexType], GL_TEXTURE_MAG_FILTER, GL_NEAREST);