Move osd_text.c to src/video_output/

src/Makefile.am

@@ -400,6 +400,7 @@ SOURCES_libvlc_common = \
 	video_output/vout_subpictures.c \
 	video_output/window.c \
 	video_output/opengl.c \
+	video_output/osd_text.c \
 	video_output/vout_intf.c \
 	video_output/vout_internal.h \
 	video_output/vout_control.h \
@@ -412,7 +413,6 @@ SOURCES_libvlc_common = \
 	audio_output/output.c \
 	audio_output/volume.c \
 	osd/osd.c \
-	osd/osd_text.c \
 	network/getaddrinfo.c \
 	network/io.c \
 	network/tcp.c \