subpackages: fix minor regression

Before subpackages, when running package there where 2 cases:
case 1: ${PACKAGES} directory exist:
  packages are created in the work/pkg directory then copies into
  ${PACKAGES} directory
case 2: ${PACKAGES} does not exist:
  packages where only created in work/pkg

After subpackages in the case 2, the packages get copied into the
  directory actually running the make package comment.

This change makes the framework behave like before subpackages

Reported by:	Antonio Huete Jimenez (tuxilio from Dragonfly irc
		channel)

Mk/bsd.port.mk

@@ -3487,11 +3487,13 @@ ${WRKDIR_PKGFILE${_SP.${sp}}}:	${_PLIST}.${sp} create-manifest ${WRKDIR}/pkg
 
 _EXTRA_PACKAGE_TARGET_DEP+=	${WRKDIR_PKGFILE${_SP.${sp}}}
 
+.      if defined(_HAVE_PACKAGES)
 ${PKGFILE${_SP.${sp}}}: ${WRKDIR_PKGFILE${_SP.${sp}}}
 	@${LN} -f ${WRKDIR_PKGFILE${_SP.${sp}}} ${PKGFILE${_SP.${sp}}} 2>/dev/null \
 		|| ${CP} -f ${WRKDIR_PKGFILE${_SP.${sp}}} ${PKGFILE${_SP.${sp}}}
 
 _EXTRA_PACKAGE_TARGET_DEP+=	${PKGFILE${_SP.${sp}}}
+.      endif
 .    endfor
 # This will be the end of the loop