audio/openal-soft: Optionally remove dependency on RTKIT/DBUS

The RTKIT functionality pulls in DBUS. As this functionallity doesn't
even work on FreeBSD, add the option to remove it.
Set the default value to "ON" to not affect the current state.

PR:		292308
Approved by:	multimedia (maintainer, timeout 6+ weeks)

audio/openal-soft/Makefile

@@ -10,8 +10,6 @@ WWW=		https://openal-soft.org/
 LICENSE=	LGPL20+
 LICENSE_FILE=	${WRKSRC}/COPYING
 
-LIB_DEPENDS=	libdbus-1.so:devel/dbus
-
 USES=		cmake compiler:c++20-lang pkgconfig tar:bzip2
 USE_LDCONFIG=	yes
 
@@ -33,11 +31,11 @@ LDFLAGS_i386=	-Wl,-z,notext
 PLIST_SUB=	SOVERSION=${PORTVERSION}
 
 OPTIONS_DEFINE=		CONFIG EXAMPLES JACK OSS PIPEWIRE PORTAUDIO \
-			PULSEAUDIO SDL SNDIO UTILS
+			PULSEAUDIO RTKIT SDL SNDIO UTILS
 OPTIONS_DEFINE_aarch64=	SIMD
 OPTIONS_DEFINE_amd64=	SIMD
 OPTIONS_DEFINE_i386=	SIMD
-OPTIONS_DEFAULT=	OSS UTILS
+OPTIONS_DEFAULT=	OSS RTKIT UTILS
 OPTIONS_DEFAULT_aarch64=SIMD
 OPTIONS_DEFAULT_amd64=	SIMD
 OPTIONS_DEFAULT_i386=	SIMD
@@ -45,6 +43,7 @@ OPTIONS_DEFAULT_i386=	SIMD
 OPTIONS_SUB=		yes
 
 CONFIG_DESC=		Install configuration utility (needs Qt6)
+RTKIT_DESC=		Real-time priority support (Linux only, requires D-Bus)
 UTILS_DESC=		Build and install utility programs
 
 CONFIG_IMPLIES=		UTILS
@@ -67,6 +66,9 @@ PORTAUDIO_CMAKE_BOOL=	ALSOFT_BACKEND_PORTAUDIO ALSOFT_REQUIRE_PORTAUDIO
 PULSEAUDIO_LIB_DEPENDS=	libpulse.so:audio/pulseaudio
 PULSEAUDIO_CMAKE_BOOL=	ALSOFT_BACKEND_PULSEAUDIO ALSOFT_REQUIRE_PULSEAUDIO
 
+RTKIT_LIB_DEPENDS=	libdbus-1.so:devel/dbus
+RTKIT_CMAKE_BOOL=	ALSOFT_RTKIT
+
 SDL_USES=		sdl
 SDL_USE=		SDL=sdl2
 SDL_CMAKE_BOOL=		ALSOFT_BACKEND_SDL2 ALSOFT_REQUIRE_SDL2