Do not symlink to a host directory

The installation of xcursor-transparent-theme creates many symbolic
links to the 'transp' cursor file, but it does so using an absolute
directory, that happens to point to the installation location, which
is incorrect when cross-compiling.

Also add the -f option so that the package can be reinstalled even if
it has already been installed.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

Index: b/cursors/Makefile.am
===================================================================
--- a/cursors/Makefile.am
+++ b/cursors/Makefile.am
@@ -91,6 +91,6 @@
 	$(INSTALL_DATA) $(CURSOR_REAL) $(DESTDIR)$(CURSOR_DIR)/ 
 	for CURSOR in $(CURSOR_NAMES); do \
 		echo '-- Installing cursor '$$CURSOR; \
-		ln -s $(DESTDIR)$(CURSOR_DIR)/transp $(DESTDIR)$(CURSOR_DIR)/$$CURSOR; \
+		ln -sf transp $(DESTDIR)$(CURSOR_DIR)/$$CURSOR; \
 	done
 
Index: b/cursors/Makefile.in
===================================================================
--- a/cursors/Makefile.in
+++ b/cursors/Makefile.in
@@ -177,7 +177,7 @@
 	$(INSTALL_DATA) $(CURSOR_REAL) $(DESTDIR)$(CURSOR_DIR)/ 
 	for CURSOR in $(CURSOR_NAMES); do \
 		echo '-- Installing cursor '$$CURSOR; \
-		ln -s $(DESTDIR)$(CURSOR_DIR)/transp $(DESTDIR)$(CURSOR_DIR)/$$CURSOR; \
+		ln -sf transp $(DESTDIR)$(CURSOR_DIR)/$$CURSOR; \
 	done
 
 # Tell versions [3.59,3.63) of GNU make to not export all variables.