i965: bump libdrm requirement to 2.4.61 and drop in-tree workaround

Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
Reviewed-by: Samuel Iglesias Gonsálvez <siglesias@igalia.com>

configure.ac

@@ -68,7 +68,7 @@ AC_SUBST([OSMESA_VERSION])
 dnl Versions for external dependencies
 LIBDRM_REQUIRED=2.4.38
 LIBDRM_RADEON_REQUIRED=2.4.56
-LIBDRM_INTEL_REQUIRED=2.4.60
+LIBDRM_INTEL_REQUIRED=2.4.61
 LIBDRM_NVVIEUX_REQUIRED=2.4.33
 LIBDRM_NOUVEAU_REQUIRED=2.4.62
 LIBDRM_FREEDRENO_REQUIRED=2.4.57

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

@@ -1330,11 +1330,6 @@ set_max_gl_versions(struct intel_screen *screen)
    }
 }
 
-/* drop when libdrm 2.4.61 is released */
-#ifndef I915_PARAM_REVISION
-#define I915_PARAM_REVISION 32
-#endif
-
 static int
 brw_get_revision(int fd)
 {