Allow for PWDCMD to override hardcoded pwd.

configure.in

@@ -446,7 +446,7 @@ target_subdir=${target_alias}
 if test ! -d ${target_subdir} ; then
   if mkdir ${target_subdir} ; then true
   else
-    echo "'*** could not make ${PWD=`pwd`}/${target_subdir}" 1>&2
+    echo "'*** could not make ${PWD=`${PWDCMD-pwd}`}/${target_subdir}" 1>&2
     exit 1
   fi
 fi
@@ -457,7 +457,7 @@ if test x"${build_alias}" != x"${host}" ; then
   if test ! -d ${build_subdir} ; then
     if mkdir ${build_subdir} ; then true
     else
-      echo "'*** could not make ${PWD=`pwd`}/${build_subdir}" 1>&2
+      echo "'*** could not make ${PWD=`${PWDCMD-pwd}`}/${build_subdir}" 1>&2
       exit 1
     fi
   fi