fixup a whole steaming pile of insanity. When packages are configured,

they should be configured with --prefix=/usr and we then need to use
make DESTDIR=$(STAGING_DIR) install to get things installed into the
staging directory.  The current situation for many packages, which use
--prefix=$(STAGING_DIR) results in the staging_dir paths getting compiled
into the binary itself.

This also adds in a pile of libtool fixups.  Between broken pkgconfig,
broken libtool handling, and broken --prefix settings, its a wonder
things have worked as well as they have up till now.
 -Erik

package/libusb/libusb.mk

@@ -29,7 +29,7 @@ $(LIBUSB_DIR)/.unpacked: $(DL_DIR)/$(LIBUSB_SOURCE)
 
 $(LIBUSB_DIR)/.configured: $(LIBUSB_DIR)/.unpacked
 	(cd $(LIBUSB_DIR); rm -rf config.cache; \
-		$(TARGET_CONFIGURE_OPTS) CC_FOR_BUILD=$(HOSTCC) \
+		$(TARGET_CONFIGURE_OPTS) \
 		CFLAGS="$(TARGET_CFLAGS)" \
 		ac_cv_header_regex_h=no \
 		ac_cv_c_bigendian=$(LIBUSB_BE) \