Revert "i965: Enable flush control"

This reverts commit 6ce9006d76.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=104490
Signed-off-by: Adam Jackson <ajax@redhat.com>

src/mesa/drivers/dri/i965/brw_context.c

@@ -860,9 +860,7 @@ brwCreateContext(gl_api api,
       return false;
    }
 
-   if (ctx_config->attribute_mask &
-       ~(__DRIVER_CONTEXT_ATTRIB_RESET_STRATEGY |
-         __DRIVER_CONTEXT_ATTRIB_RELEASE_BEHAVIOR)) {
+   if (ctx_config->attribute_mask & ~__DRIVER_CONTEXT_ATTRIB_RESET_STRATEGY) {
       *dri_ctx_error = __DRI_CTX_ERROR_UNKNOWN_ATTRIBUTE;
       return false;
    }
@@ -871,20 +869,6 @@ brwCreateContext(gl_api api,
       ((ctx_config->attribute_mask & __DRIVER_CONTEXT_ATTRIB_RESET_STRATEGY) &&
        ctx_config->reset_strategy != __DRI_CTX_RESET_NO_NOTIFICATION);
 
-   GLenum release_behavior = GL_CONTEXT_RELEASE_BEHAVIOR_FLUSH;
-   if (ctx_config->attribute_mask & __DRIVER_CONTEXT_ATTRIB_RELEASE_BEHAVIOR) {
-      switch (ctx_config->release_behavior) {
-      case __DRI_CTX_RELEASE_BEHAVIOR_NONE:
-         release_behavior = GL_NONE;
-         break;
-      case __DRI_CTX_RELEASE_BEHAVIOR_FLUSH:
-         break;
-      default:
-         *dri_ctx_error = __DRI_CTX_ERROR_UNKNOWN_ATTRIBUTE;
-         return false;
-      }
-   }
-
    struct brw_context *brw = rzalloc(NULL, struct brw_context);
    if (!brw) {
       fprintf(stderr, "%s: failed to alloc context\n", __func__);
@@ -1064,8 +1048,6 @@ brwCreateContext(gl_api api,
       ctx->Const.RobustAccess = GL_TRUE;
    }
 
-   ctx->Const.ContextReleaseBehavior = release_behavior;
-
    if (INTEL_DEBUG & DEBUG_SHADER_TIME)
       brw_init_shader_time(brw);
 

src/mesa/drivers/dri/i965/intel_screen.c

@@ -1503,7 +1503,6 @@ static const __DRIextension *screenExtensions[] = {
     &intelRendererQueryExtension.base,
     &dri2ConfigQueryExtension.base,
     &dri2NoErrorExtension.base,
-    &dri2FlushControlExtension.base,
     NULL
 };
 
@@ -1514,7 +1513,6 @@ static const __DRIextension *intelRobustScreenExtensions[] = {
     &intelImageExtension.base,
     &intelRendererQueryExtension.base,
     &dri2ConfigQueryExtension.base,
-    &dri2FlushControlExtension.base,
     &dri2Robustness.base,
     &dri2NoErrorExtension.base,
     NULL