v3d: Enable the driver by default.

Now that we have a stabilized ABI and a fairly conformant driver, turn it
on.

configure.ac

@@ -2740,7 +2740,7 @@ if test -n "$with_gallium_drivers"; then
             PKG_CHECK_MODULES([V3D_SIMULATOR], [v3dv3],
                               [USE_V3D_SIMULATOR=yes;
                                DEFINES="$DEFINES -DUSE_V3D_SIMULATOR"],
-                              [AC_MSG_ERROR([vc5 requires the simulator])])
+                              [USE_V3D_SIMULATOR=no])
             ;;
         xpl111)
             HAVE_GALLIUM_PL111=yes

src/gallium/drivers/v3d/meson.build

@@ -53,7 +53,7 @@ files_per_version = files(
 )
 
 v3dv3_c_args = []
-dep_v3dv3 = dependency('v3dv3')
+dep_v3dv3 = dependency('v3dv3', required: false)
 if dep_v3dv3.found()
   v3dv3_c_args = '-DUSE_V3D_SIMULATOR'
 endif