surfaceflinger / GL extensions cleanup

Add correct enumerants for OES_EGL_image_external to glext.h.
SurfaceFlinger now checks for the correct extension name.

Change-Id: I2ba2728a01fa2260bd086d2df4316c68f694a9b1
diff --git a/services/surfaceflinger/TextureManager.cpp b/services/surfaceflinger/TextureManager.cpp
index 76f6159..c9a15f5 100644
--- a/services/surfaceflinger/TextureManager.cpp
+++ b/services/surfaceflinger/TextureManager.cpp
@@ -43,7 +43,7 @@
 }
 
 GLenum TextureManager::getTextureTarget(const Image* image) {
-#if defined(GL_OES_texture_external)
+#if defined(GL_OES_EGL_image_external)
     switch (image->target) {
         case Texture::TEXTURE_EXTERNAL:
             return GL_TEXTURE_EXTERNAL_OES;
@@ -85,7 +85,7 @@
     pImage->height = 0;
 
     GLenum target = GL_TEXTURE_2D;
-#if defined(GL_OES_texture_external)
+#if defined(GL_OES_EGL_image_external)
     if (GLExtensions::getInstance().haveTextureExternal()) {
         if (format && isYuvFormat(format)) {
             target = GL_TEXTURE_EXTERNAL_OES;
@@ -306,7 +306,7 @@
     if (target == GL_TEXTURE_2D) {
         glBindTexture(GL_TEXTURE_2D, texture.name);
         glEnable(GL_TEXTURE_2D);
-#if defined(GL_OES_texture_external)
+#if defined(GL_OES_EGL_image_external)
         if (GLExtensions::getInstance().haveTextureExternal()) {
             glDisable(GL_TEXTURE_EXTERNAL_OES);
         }
@@ -329,7 +329,7 @@
 void TextureManager::deactivateTextures()
 {
     glDisable(GL_TEXTURE_2D);
-#if defined(GL_OES_texture_external)
+#if defined(GL_OES_EGL_image_external)
     if (GLExtensions::getInstance().haveTextureExternal()) {
         glDisable(GL_TEXTURE_EXTERNAL_OES);
     }