gallium/swr: Fix glClear when it's used with glEnable/glDisable GL_SCISSOR_TEST

When GL_SCISSOR_TEST is enabled glClear is handled by state tracker
and there is no need to do this in gallium driver.

Reviewed-by: Alok Hota alok.hota@intel.com
13 jobs for !1629 with fix-swr-glclear-scissors in 13 minutes and 21 seconds (queued for 1 minute and 14 seconds)
detached
Status Name Job ID Coverage
  Containers Build
passed debian #491888

00:00:20

 
  Build+Test
passed meson-arm64 #491897

00:02:55

passed meson-armhf #491896

00:03:14

passed meson-clang #491890

00:11:49

passed meson-clover #491894

00:06:49

passed meson-i386 #491898

00:02:18

passed meson-main #491893

00:06:14

passed meson-swr-glvnd #491889

00:04:17

passed meson-vulkan #491895

00:03:19

passed scons-llvm #491900

00:05:39

passed scons-nollvm #491899

00:03:49

passed scons-swr #491891

00:05:31

passed scons-win64 #491892

00:06:03