Revert bogus GlxPushProvider() in commit a1d41e3

a1d41e3 "Move extension initialisation prototypes into extinit.h"
also includes a change to GlxExtensionInit to install the swrast GLX
provider.

Since b86aa74 "GLX: Insert swrast provider from GlxExtensionInit"
already does this (correctly, by installing the swrast provider
at the end of the chain, rather than at the beginning), and since this
would seem to have the effect of making the swrast provider the most
preferred provider, I'm guessing this wasn't intended.

Signed-off-by: Jon TURNEY <jon.turney@dronecode.org.uk>
Reviewed-by: Daniel Stone <daniel@fooishbar.org>
Reviewed-by: Colin Harrison <colin.harrison@virgin.net>

glx/glxext.c

@@ -339,9 +339,6 @@ GlxExtensionInit(void)
     if (!__glXContextRes || !__glXDrawableRes)
         return;
 
-    if (serverGeneration == 1)
-        GlxPushProvider(&__glXDRISWRastProvider);
-
     if (!dixRegisterPrivateKey
         (&glxClientPrivateKeyRec, PRIVATE_CLIENT, sizeof(__GLXclientState)))
         return;