broadcom/vc4: Bump libdrm requirement

Require a version of libdrm with syncobj support.

v2: Don't require a libdrm_vc4, just bump core libdrm if vc4 enabled (by
    anholt)

Signed-off-by: Stefan Schake <stschake@gmail.com>
Reviewed-by: Eric Anholt <eric@anholt.net>

configure.ac

@@ -80,6 +80,7 @@ LIBDRM_NVVIEUX_REQUIRED=2.4.66
 LIBDRM_NOUVEAU_REQUIRED=2.4.66
 LIBDRM_FREEDRENO_REQUIRED=2.4.92
 LIBDRM_ETNAVIV_REQUIRED=2.4.89
+LIBDRM_VC4_REQUIRED=2.4.89
 
 dnl Versions for external dependencies
 DRI2PROTO_REQUIRED=2.8
@@ -2727,6 +2728,7 @@ if test -n "$with_gallium_drivers"; then
             ;;
         xvc4)
             HAVE_GALLIUM_VC4=yes
+            PKG_CHECK_MODULES([VC4], [libdrm >= $LIBDRM_VC4_REQUIRED])
 
             PKG_CHECK_MODULES([SIMPENROSE], [simpenrose],
                               [USE_VC4_SIMULATOR=yes;

meson.build

@@ -1055,6 +1055,12 @@ _libdrm_checks = [
   ['freedreno', with_gallium_freedreno],
 ]
 
+# VC4 only needs core libdrm support of this version, not a libdrm_vc4
+# library.
+if with_gallium_vc4
+  _drm_ver = '2.4.89'
+endif
+
 # Loop over the enables versions and get the highest libdrm requirement for all
 # active drivers.
 foreach d : _libdrm_checks