[ioquake3] 18/25: Correct test for GL_EXT_texture_env_add support

[Simon McVittie]

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smcv pushed a commit to branch debian/master
in repository ioquake3.

commit 6b514ee532acd9ff5bfb3819328ac6131d69e345
Author: Wolf <wolfwings at wolfwings.us>
Date:   Wed Jan 25 17:58:09 2017 -0600

    Correct test for GL_EXT_texture_env_add support
    
    The test string is missing the initial "GL_" so it is always failing the test even when supported on newer hardware.
---
 code/sdl/sdl_glimp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/code/sdl/sdl_glimp.c b/code/sdl/sdl_glimp.c
index 7160d6f..155b84b 100644
--- a/code/sdl/sdl_glimp.c
+++ b/code/sdl/sdl_glimp.c
@@ -627,7 +627,7 @@ static void GLimp_InitExtensions( void )
 
 	// GL_EXT_texture_env_add
 	glConfig.textureEnvAddAvailable = qfalse;
-	if ( SDL_GL_ExtensionSupported( "EXT_texture_env_add" ) )
+	if ( SDL_GL_ExtensionSupported( "GL_EXT_texture_env_add" ) )
 	{
 		if ( r_ext_texture_env_add->integer )
 		{

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