glx: don't expose systemTimeExtension for DRI2/DRI3/DRISW

Used/applicable to only dri1 drivers.

Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>

src/glx/dri2_glx.c

@@ -1393,8 +1393,6 @@ dri2CreateDisplay(Display * dpy)
    else
       pdp->loader_extensions[i++] = &dri2LoaderExtension.base;
    
-   pdp->loader_extensions[i++] = &systemTimeExtension.base;
-
    pdp->loader_extensions[i++] = &dri2UseInvalidate.base;
 
    pdp->loader_extensions[i++] = NULL;

src/glx/dri3_glx.c

@@ -511,7 +511,6 @@ const __DRIuseInvalidateExtension dri3UseInvalidate = {
 
 static const __DRIextension *loader_extensions[] = {
    &imageLoaderExtension.base,
-   &systemTimeExtension.base,
    &dri3UseInvalidate.base,
    NULL
 };

src/glx/drisw_glx.c

@@ -219,7 +219,6 @@ static const __DRIswrastLoaderExtension swrastLoaderExtension = {
 };
 
 static const __DRIextension *loader_extensions[] = {
-   &systemTimeExtension.base,
    &swrastLoaderExtension.base,
    NULL
 };