Add `tool' as an option for BUILDLINK3_DEPMETHOD.  XXX WRONG!

This was a provisional kludge to make stuff that abused buildlink3
(notably xmlcatmgr) cross-compile.

Index: mk/buildlink3/bsd.buildlink3.mk
===================================================================
RCS file: /cvsroot/pkgsrc/mk/buildlink3/bsd.buildlink3.mk,v
retrieving revision 1.218
diff -p -u -r1.218 bsd.buildlink3.mk
--- mk/buildlink3/bsd.buildlink3.mk	2 Feb 2013 01:04:59 -0000	1.218
+++ mk/buildlink3/bsd.buildlink3.mk	23 Apr 2013 13:29:19 -0000
@@ -202,6 +202,9 @@ _BLNK_ABIMETHOD.${_pkg_}=	_BLNK_ADD_TO.A
 .  elif !empty(BUILDLINK_DEPMETHOD.${_pkg_}:Mbuild)
 _BLNK_DEPMETHOD.${_pkg_}=	_BLNK_ADD_TO.BUILD_DEPENDS
 _BLNK_ABIMETHOD.${_pkg_}=	_BLNK_ADD_TO.BUILD_ABI_DEPENDS
+.  elif !empty(BUILDLINK_DEPMETHOD.${_pkg_}:Mtool)
+_BLNK_DEPMETHOD.${_pkg_}=	_BLNK_ADD_TO.TOOL_DEPENDS
+#_BLNK_ABIMETHOD.${_pkg_}=	_BLNK_ADD_TO.TOOL_ABI_DEPENDS # XXX?
 .  endif
 .  if defined(BUILDLINK_API_DEPENDS.${_pkg_}) && \
       defined(BUILDLINK_PKGSRCDIR.${_pkg_})
@@ -220,7 +223,7 @@ ${_BLNK_ABIMETHOD.${_pkg_}}+=	${_abi_}:$
 .    endfor
 .  endif
 .endfor
-.for _depmethod_ in DEPENDS BUILD_DEPENDS ABI_DEPENDS BUILD_ABI_DEPENDS
+.for _depmethod_ in DEPENDS BUILD_DEPENDS ABI_DEPENDS BUILD_ABI_DEPENDS TOOL_DEPENDS # TOOL_ABI_DEPENDS XXX?
 .  if !empty(_BLNK_ADD_TO.${_depmethod_})
 ${_depmethod_}+=	${_BLNK_ADD_TO.${_depmethod_}}
 .  endif
@@ -307,13 +310,20 @@ BUILDLINK_LIBDIRS.${_pkg_}?=	lib${LIBABI
 #
 .  if !defined(_BLNK_PKG_DBDIR.${_pkg_})
 _BLNK_PKG_DBDIR.${_pkg_}?=	# empty
+.  if !empty(BUILDLINK_DEPMETHOD.${_pkg_}:Mtool)
+_BLNK_XXX_PKG_INFO=	${HOST_PKG_INFO}
+_BLNK_XXX_PKG_DBDIR=	${_HOST_PKG_DBDIR}
+.else
+_BLNK_XXX_PKG_INFO=	${PKG_INFO}
+_BLNK_XXX_PKG_DBDIR=	${_PKG_DBDIR}
+.endif
 .    for _depend_ in ${BUILDLINK_API_DEPENDS.${_pkg_}}
 .      if empty(_BLNK_PKG_DBDIR.${_pkg_}:M*not_found)
 _BLNK_PKG_DBDIR.${_pkg_}!=	\
-	pkg=`${PKG_INFO} -E "${_depend_}" || ${TRUE}`;			\
+	pkg=`${_BLNK_XXX_PKG_INFO} -E "${_depend_}" || ${TRUE}`;	\
 	case "$$pkg" in							\
 	"")	dir="_BLNK_PKG_DBDIR.${_pkg_}_not_found" ;;		\
-	*)	dir="${_PKG_DBDIR}/$$pkg";				\
+	*)	dir="${_BLNK_XXX_PKG_DBDIR}/$$pkg";			\
 		if [ -f $$dir/+DEPOT ]; then				\
 			dir=`${HEAD} -1 $$dir/+DEPOT`;			\
 		fi ;;							\
@@ -329,7 +339,7 @@ MAKEVARS+=	_BLNK_PKG_DBDIR.${_pkg_}
 .  if empty(_BLNK_PKG_DBDIR.${_pkg_}:M*not_found)
 _BLNK_PKG_INFO.${_pkg_}?=	${PKG_INFO_CMD} -K ${_BLNK_PKG_DBDIR.${_pkg_}:H}
 .  else
-_BLNK_PKG_INFO.${_pkg_}?=	${PKG_INFO_CMD} -K ${_PKG_DBDIR}
+_BLNK_PKG_INFO.${_pkg_}?=	${PKG_INFO_CMD} -K ${_BLNK_XXX_PKG_DBDIR}
 .  endif
 
 BUILDLINK_PKGNAME.${_pkg_}?=	${_BLNK_PKG_DBDIR.${_pkg_}:T}