openal: treat like poppler: set MODCLANG_VERSION = 22, bdep on llvm/19

The bdep kludge can be removed after the llvm22 switch.

audio/openal/Makefile

@@ -6,6 +6,8 @@ PKGNAME =	openal-$V
 EPOCH =		0
 CATEGORIES =	audio
 
+REVISION =	0
+
 SHARED_LIBS =	openal	6.0
 
 HOMEPAGE =	https://openal-soft.org/
@@ -39,6 +41,10 @@ CONFIGURE_ARGS =-DALSOFT_BACKEND_PIPEWIRE=Off \
 		-DCMAKE_DISABLE_FIND_PACKAGE_SDL2:Bool=Yes \
 		-DCMAKE_DISABLE_FIND_PACKAGE_SndFile:Bool=Yes
 
+MODCLANG_VERSION = 22
+# XXX - remove after switch to llvm 22
+BUILD_DEPENDS =	devel/llvm/19
+
 MODCMAKE_POLICY_VERSION_OVERRIDE = Yes
 
 .if ${MACHINE_ARCH} == "arm"