build: Remove unused Makefile.am

We switched to a non-recursive layout, hence we don't need Makefile.am
in the osx/ and fruity/ sub-directories.

clutter/fruity/Makefile.am

@@ -1,24 +0,0 @@
-libclutterincludedir = $(includedir)/clutter-@CLUTTER_API_VERSION@/clutter
-
-INCLUDES = \
-	-DG_LOG_DOMAIN=\"ClutterFruity\"	\
-        -DCLUTTER_COMPILATION 			\
-	-I$(top_srcdir) 			\
-	-I$(top_srcdir)/clutter 		\
-	-I$(top_srcdir)/clutter/cogl 		\
-	-I$(top_builddir)/clutter 		\
-	-I$(top_builddir)/clutter/cogl
-
-common_ldadd = $(CLUTTER_LIBS)
-
-noinst_LTLIBRARIES = libclutter-fruity.la
-
-libclutter_fruity_la_CFLAGS = $(CLUTTER_CFLAGS) $(CLUTTER_DEBUG_CFLAGS) $(MAINTAINER_CFLAGS) -xobjective-c
-libclutter_fruity_la_LIBADD = $(common_ldadd)
-libclutter_fruity_la_SOURCES = 		\
-	clutter-backend-fruity.h 	\
-	clutter-backend-fruity.c 	\
-	clutter-stage-fruity.h 		\
-	clutter-stage-fruity.c 		\
-	clutter-fruity.h 		\
-	clutter-fruity.c

clutter/osx/Makefile.am

@@ -1,25 +0,0 @@
-libclutterincludedir = $(includedir)/clutter-@CLUTTER_API_VERSION@/clutter
-libclutterinclude_HEADERS = clutter-osx.h
-
-INCLUDES = \
-	-DG_LOG_DOMAIN=\"ClutterOSX\" 	\
-        -DCLUTTER_COMPILATION 		\
-	-I$(top_srcdir) 		\
-	-I$(top_srcdir)/clutter 	\
-	-I$(top_srcdir)/clutter/cogl 	\
-	-I$(top_builddir)/clutter 	\
-	-I$(top_builddir)/clutter/cogl
-
-common_ldadd = $(CLUTTER_LIBS)
-
-noinst_LTLIBRARIES = libclutter-osx.la
-
-libclutter_osx_la_CFLAGS = $(CLUTTER_CFLAGS) $(CLUTTER_DEBUG_CFLAGS) $(MAINTAINER_CFLAGS) -xobjective-c
-libclutter_osx_la_LIBADD = $(common_ldadd)
-libclutter_osx_la_SOURCES = 	\
-	clutter-backend-osx.h 	\
-	clutter-backend-osx.c 	\
-	clutter-event-osx.c 	\
-	clutter-stage-osx.h 	\
-	clutter-stage-osx.c 	\
-	clutter-osx.h