Makefiles: Remove target-specific variables

Improve portability with non-GNU make by using standard variables.

Signed-off-by: Chris Dickens <christopher.a.dickens@gmail.com>
diff --git a/Makefile.am b/Makefile.am
index 047be99..09d7cf5 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -35,9 +35,9 @@
 	rm -f $(distdir)/README.orig
 	rm -f $(distdir)/msvc/.gitattributes
 
+reldir = .release/$(distdir)
+sfurl = frs.sourceforge.net:/home/frs/project/libusb/libusb-1.0
 .PHONY: dist-upload
-dist-upload: reldir = .release/$(distdir)
-dist-upload: sfurl = frs.sourceforge.net:/home/frs/project/libusb/libusb-1.0
 dist-upload: dist
 	rm -rf $(reldir)
 	mkdir -p $(reldir)
diff --git a/doc/Makefile.in b/doc/Makefile.in
index 3d835c5..26400b5 100644
--- a/doc/Makefile.in
+++ b/doc/Makefile.in
@@ -8,7 +8,7 @@
 @DOXYGEN_HTMLDIR@: doxygen.cfg libusb.png $(LIBUSB_DOC_SRC)
 	doxygen $<
 
-docs-upload: sfurl = web.sourceforge.net:/home/project-web/libusb/htdocs
+sfurl = web.sourceforge.net:/home/project-web/libusb/htdocs
 docs-upload: @DOXYGEN_HTMLDIR@
 	if [ -z "$$SF_USER" ]; then \
 		rsync -rv --delete $< $(sfurl); \
diff --git a/libusb/version_nano.h b/libusb/version_nano.h
index f5243a0..a3ee32f 100644
--- a/libusb/version_nano.h
+++ b/libusb/version_nano.h
@@ -1 +1 @@
-#define LIBUSB_NANO 11489
+#define LIBUSB_NANO 11490