Remove -force_cpusubtype_ALL. It is only useful when building for PowerPC and as
of Xcode 15 the linker no longer accepts this flag.

https://gitlab.xiph.org/xiph/vorbis/-/issues/2348

We still want to use it in MacPorts when building for PowerPC, so we re-add it
conditionally in the Portfile.
--- configure.orig	2020-07-04 01:20:13.000000000 -0500
+++ configure	2023-09-25 19:53:58.000000000 -0500
@@ -12840,9 +12840,9 @@
 		CFLAGS="-O3 -Wall -Wextra -ffast-math -D__NO_MATH_INLINES -fsigned-char $sparc_cpu"
 		PROFILE="-pg -g -O3 -D__NO_MATH_INLINES -fsigned-char $sparc_cpu" ;;
 	*-*-darwin*)
-		DEBUG="-DDARWIN -fno-common -force_cpusubtype_ALL -Wall -g -O0 -fsigned-char"
-		CFLAGS="-DDARWIN -fno-common -force_cpusubtype_ALL -Wall -g -O3 -ffast-math -fsigned-char"
-		PROFILE="-DDARWIN -fno-common -force_cpusubtype_ALL -Wall -g -pg -O3 -ffast-math -fsigned-char";;
+		DEBUG="-DDARWIN -fno-common -Wall -g -O0 -fsigned-char"
+		CFLAGS="-DDARWIN -fno-common -Wall -g -O3 -ffast-math -fsigned-char"
+		PROFILE="-DDARWIN -fno-common -Wall -g -pg -O3 -ffast-math -fsigned-char";;
 	*-*-os2*)
 		# Use -W instead of -Wextra because gcc on OS/2 is an old version.
 		DEBUG="-g -Wall -W -D_REENTRANT -D__NO_MATH_INLINES -fsigned-char"