libobs: add ppc64(le) specific flags to libobs.pc

-DNO_WARN_X86_INTRINSICS -mvsx flags are necessary on PPC64(LE), but
those flags haven't been added yet to libobs.pc, making some plugins
fail to build.

libobs/CMakeLists.txt

@@ -465,6 +465,9 @@ if(UNIX AND NOT APPLE)
 	foreach(LIB "obs" "rt")
 		set(PRIVATE_LIBS "${PRIVATE_LIBS} -l${LIB}")
 	endforeach()
+	if(LOWERCASE_CMAKE_SYSTEM_PROCESSOR MATCHES "^(powerpc|ppc)64(le)?")
+		set(PPC64_CFLAGS "-DNO_WARN_X86_INTRINSICS -mvsx")
+	endif()
 	CONFIGURE_FILE("libobs.pc.in" "libobs.pc" @ONLY)
 	install(FILES "${CMAKE_CURRENT_BINARY_DIR}/libobs.pc" DESTINATION "${CMAKE_INSTALL_LIBDIR}/pkgconfig")
 endif()

libobs/libobs.pc.in

@@ -7,5 +7,5 @@ Name: libobs
 Description: OBS Studio Library
 Version: @OBS_VERSION@
 Requires: x11
-Cflags: -I${includedir}
+Cflags: -I${includedir} @PPC64_CFLAGS@
 Libs: -L${libdir} @PRIVATE_LIBS@