feh: install in /usr

By default, feh installs into /usr/local. Adjusting the prefix to point
to a system distribution path.

Signed-off-by: James Knight <james.knight@rockwellcollins.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/feh/feh.mk

@@ -18,7 +18,7 @@ endef
 
 define FEH_INSTALL_TARGET_CMDS
 	$(MAKE1) CC="$(TARGET_CC) $(TARGET_CFLAGS) $(TARGET_LDFLAGS) " \
-		DESTDIR=$(TARGET_DIR) -C $(@D) install
+		PREFIX=/usr DESTDIR=$(TARGET_DIR) -C $(@D) install
 endef
 
 $(eval $(generic-package))