Install spl-devel products in /usr/src/spl-SPL_VERSION/LINUX_VERSION/

Remove the spl symlink, it's just confusing

Makefile.am

@@ -16,11 +16,11 @@ distclean-local::
 		-type f -print | xargs $(RM)
 
 install-data-local:
-	instdest=$(DESTDIR)/${prefix}/src/spl-$(SPL_META_VERSION); \
+	destname=spl-$(SPL_META_VERSION)/$(LINUX_VERSION); \
+	instdest=$(DESTDIR)/${prefix}/src/$$destname; \
 	for instfile in $(noinst_HEADERS) module/$(LINUX_SYMBOLS); do \
 		$(INSTALL) -D $$instfile $$instdest/$$instfile; \
 	done
-	(cd $(DESTDIR)/${prefix}/src && ln -f -s spl-$(SPL_META_VERSION) spl)
 
 ctags:
 	$(RM) $(top_srcdir)/tags

Makefile.in

@@ -661,11 +661,11 @@ distclean-local::
 		-type f -print | xargs $(RM)
 
 install-data-local:
-	instdest=$(DESTDIR)/${prefix}/src/spl-$(SPL_META_VERSION); \
+	destname=spl-$(SPL_META_VERSION)/$(LINUX_VERSION); \
+	instdest=$(DESTDIR)/${prefix}/src/$$destname; \
 	for instfile in $(noinst_HEADERS) module/$(LINUX_SYMBOLS); do \
 		$(INSTALL) -D $$instfile $$instdest/$$instfile; \
 	done
-	(cd $(DESTDIR)/${prefix}/src && ln -f -s spl-$(SPL_META_VERSION) spl)
 
 ctags:
 	$(RM) $(top_srcdir)/tags

include/Makefile.am

@@ -16,7 +16,8 @@ noinst_HEADERS += util/*.h
 noinst_HEADERS += vm/*.h
 
 install-data-local:
-	instdest=$(DESTDIR)/${prefix}/src/spl-$(SPL_META_VERSION); \
+	destname=spl-$(SPL_META_VERSION)/$(LINUX_VERSION); \
+	instdest=$(DESTDIR)/${prefix}/src/$$destname; \
 	instfiles=`find . -name '*.h'`; \
         for instfile in $$instfiles; do \
 		$(INSTALL) -D $$instfile $$instdest/$$instfile; \

include/Makefile.in

@@ -388,7 +388,8 @@ uninstall-am: uninstall-info-am
 
 
 install-data-local:
-	instdest=$(DESTDIR)/${prefix}/src/spl-$(SPL_META_VERSION); \
+	destname=spl-$(SPL_META_VERSION)/$(LINUX_VERSION); \
+	instdest=$(DESTDIR)/${prefix}/src/$$destname; \
 	instfiles=`find . -name '*.h'`; \
         for instfile in $$instfiles; do \
 		$(INSTALL) -D $$instfile $$instdest/$$instfile; \