Add uninstall Makefile targets

Extend the Makefiles with an uninstall target to cleanly
remove a package which was installed with 'make install'.

Additionally, ensure a 'depmod -a' is run as part of the
install to update the module dependency information.

include/Makefile.am

@@ -16,8 +16,13 @@ noinst_HEADERS += vm/*.h
 
 install-data-local:
 	destname=spl-$(SPL_META_VERSION)/$(LINUX_VERSION); \
-	instdest=$(DESTDIR)/${prefix}/src/$$destname; \
+	instdest=$(DESTDIR)/usr/src/$$destname; \
 	instfiles=`find . -name '*.h'`; \
         for instfile in $$instfiles; do \
 		$(INSTALL) -D $$instfile $$instdest/$$instfile; \
         done
+
+uninstall-local:
+	destname=spl-$(SPL_META_VERSION)/$(LINUX_VERSION); \
+	instdest=$(DESTDIR)/usr/src/$$destname; \
+	$(RM) -R $$instdest

include/Makefile.in

@@ -431,7 +431,7 @@ ps: ps-am
 
 ps-am:
 
-uninstall-am:
+uninstall-am: uninstall-local
 
 .MAKE: install-am install-strip
 
@@ -446,17 +446,22 @@ uninstall-am:
 	installcheck installcheck-am installdirs maintainer-clean \
 	maintainer-clean-generic mostlyclean mostlyclean-generic \
 	mostlyclean-libtool pdf pdf-am ps ps-am tags uninstall \
-	uninstall-am
+	uninstall-am uninstall-local
 
 
 install-data-local:
 	destname=spl-$(SPL_META_VERSION)/$(LINUX_VERSION); \
-	instdest=$(DESTDIR)/${prefix}/src/$$destname; \
+	instdest=$(DESTDIR)/usr/src/$$destname; \
 	instfiles=`find . -name '*.h'`; \
         for instfile in $$instfiles; do \
 		$(INSTALL) -D $$instfile $$instdest/$$instfile; \
         done
 
+uninstall-local:
+	destname=spl-$(SPL_META_VERSION)/$(LINUX_VERSION); \
+	instdest=$(DESTDIR)/usr/src/$$destname; \
+	$(RM) -R $$instdest
+
 # Tell versions [3.59,3.63) of GNU make to not export all variables.
 # Otherwise a system limit (for SysV at least) may be exceeded.
 .NOEXPORT: