sysutils/tracker3: fix build with clang 16

Clang 16 has a new error about incompatible function types, which shows
up when building sysutils/tracker3:

  ../src/libtracker-sparql/bus/tracker-bus.vala:20:56: error: incompatible function pointer types assigning to 'void (*)(TrackerSparqlConnection *, GCancellable *, GAsyncReadyCallback, gpointer)' (aka 'void (*)(struct _TrackerSparqlConnection *, struct _GCancellable *, void (*)(struct _GObject *, struct _GAsyncResult *, void *), void *)') from 'void (*)(TrackerSparqlConnection *, GAsyncReadyCallback, gpointer)' (aka 'void (*)(struct _TrackerSparqlConnection *, void (*)(struct _GObject *, struct _GAsyncResult *, void *), void *)') [-Wincompatible-function-pointer-types]
          ((TrackerSparqlConnectionClass *) klass)->close_async = (void (*) (TrackerSparqlConnection*, GAsyncReadyCallback, gpointer)) tracker_bus_connection_real_close_async;
                                                                ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Since the error occurs in vala-generated code, it does not make sense to
patch the .c file. Suppress the warning instead.

PR:		271968
Approved by:	vishwin, fernape
MFH:		2023Q2

sysutils/tracker3/Makefile

@@ -1,6 +1,6 @@
 PORTNAME=	tracker
 PORTVERSION=	3.1.2
-PORTREVISION=	7
+PORTREVISION=	8
 CATEGORIES=	sysutils gnome
 MASTER_SITES=	GNOME
 PKGNAMESUFFIX=	3
@@ -43,8 +43,14 @@ MAN_BUILD_DEPENDS=	asciidoc:textproc/asciidoc
 MAN_MESON_TRUE=		man
 MAN_DESC=		Install manual pages
 
+.include <bsd.port.pre.mk>
+
+.if ${COMPILER_TYPE} == clang
+CFLAGS+=	-Wno-incompatible-function-pointer-types
+.endif
+
 post-patch:
 	${REINPLACE_CMD} -e 's|/etc/asciidoc|${PYTHONPREFIX_SITELIBDIR}/asciidoc/resources|' \
 		${WRKSRC}/docs/manpages/meson.build
 
-.include <bsd.port.mk>
+.include <bsd.port.post.mk>