audio/faudio: add SDL3 flavor (default since 25.03)

audio/faudio/Makefile

@@ -9,9 +9,15 @@ WWW=		https://fna-xna.github.io/
 LICENSE=	ZLIB
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
+FLAVORS=	sdl2 sdl3
+sdl2_CONFLICTS_INSTALL=	${PORTNAME}-sdl3
+sdl3_PKGNAMESUFFIX=	-sdl3
+sdl3_CONFLICTS_INSTALL=	${PORTNAME}
+
 USES=		cmake compiler:c11 sdl
-USE_SDL=	sdl2
+USE_SDL=	${FLAVOR}
 USE_LDCONFIG=	yes
+CMAKE_${"${FLAVOR:Msdl3}":?ON:OFF}=	BUILD_SDL3
 
 USE_GITHUB=	yes
 GH_ACCOUNT=	FNA-XNA

audio/faudio/files/patch-cmake_config.cmake.in

@@ -0,0 +1,14 @@
+--- cmake/config.cmake.in.orig	2025-02-01 15:45:39 UTC
++++ cmake/config.cmake.in
+@@ -2,7 +2,11 @@ if(NOT "@PLATFORM_WIN32@")
+ 
+ if(NOT "@PLATFORM_WIN32@")
+ 	include(CMakeFindDependencyMacro)
++  if ("@BUILD_SDL3@")
++	find_dependency(SDL3 CONFIG)
++  else()
+ 	find_dependency(SDL2 CONFIG)
++  endif()
+ endif()
+ 
+ if(EXISTS "${CMAKE_CURRENT_LIST_DIR}/@CMAKE_PROJECT_NAME@-targets-shared.cmake")