pkg-generic: reinstall target

Add a <pkg>-reinstall target, just like <pkg>-rebuild and
<pkg>-reconfigure, but that only retrigger the install step of the
package.

Signed-off-by: Doug Kehn <rdkehn@yahoo.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/pkg-generic.mk

@@ -577,16 +577,20 @@ $(1)-graph-depends: graph-depends-requirements
 
 $(1)-dirclean:		$$($(2)_TARGET_DIRCLEAN)
 
-$(1)-clean-for-rebuild:
+$(1)-clean-for-reinstall:
 ifneq ($$($(2)_OVERRIDE_SRCDIR),)
 			rm -f $$($(2)_TARGET_RSYNC)
 endif
-			rm -f $$($(2)_TARGET_BUILD)
 			rm -f $$($(2)_TARGET_INSTALL_STAGING)
 			rm -f $$($(2)_TARGET_INSTALL_TARGET)
 			rm -f $$($(2)_TARGET_INSTALL_IMAGES)
 			rm -f $$($(2)_TARGET_INSTALL_HOST)
 
+$(1)-reinstall:		$(1)-clean-for-reinstall $(1)
+
+$(1)-clean-for-rebuild: $(1)-clean-for-reinstall
+			rm -f $$($(2)_TARGET_BUILD)
+
 $(1)-rebuild:		$(1)-clean-for-rebuild $(1)
 
 $(1)-clean-for-reconfigure: $(1)-clean-for-rebuild