Change $(pkgcachedir) to $(fc_cachedir) in fc-cat and fc-cache Makefile.am

make distcheck caught this bug; the effect of 'make uninstall'
would have been to execute 'rm -rf /', somewhat less that desirable.

fc-cache/Makefile.am

@@ -27,13 +27,11 @@ FC_CACHE_SRC=${top_srcdir}/fc-cache
 
 SGML = ${FC_CACHE_SRC}/fc-cache.sgml
 
-AM_CPPFLAGS = -DPKGCACHEDIR='"${pkgcachedir}"'
-
 install-data-local:
-	-$(mkinstalldirs) "$(DESTDIR)$(pkgcachedir)"
+	-$(mkinstalldirs) "$(DESTDIR)$(fc_cachedir)"
 
 uninstall-local:
-	-$(RM) -rf "$(DESTDIR)$(pkgcachedir)"
+	-$(RM) -rf "$(DESTDIR)$(fc_cachedir)"
 
 INCLUDES=-I${top_srcdir} -I${top_srcdir}/src $(FREETYPE_CFLAGS)
 

fc-cat/Makefile.am

@@ -27,8 +27,6 @@ FC_CAT_SRC=${top_srcdir}/fc-cat
 
 SGML = ${FC_CAT_SRC}/fc-cat.sgml
 
-AM_CPPFLAGS = -DPKGCACHEDIR='"${pkgcachedir}"'
-
 INCLUDES=-I${top_srcdir} $(FREETYPE_CFLAGS)
 
 bin_PROGRAMS=fc-cat