m4/s48_create_build_dirs.m4: Should use `AC_CONFIG_COMMANDS'

	May I suggest the following patch?

m4/s48_create_build_dirs.m4 (S48_CREATE_BUILD_DIRS): Use
`AC_CONFIG_COMMANDS' so that the directories will be made at the time of
`config.status', not `configure'.

diff -r 293c27a240bc m4/s48_create_build_dirs.m4
--- a/m4/s48_create_build_dirs.m4	Wed Apr 16 18:45:32 2008 +0700
+++ b/m4/s48_create_build_dirs.m4	Mon Apr 28 00:37:37 2008 +0700
@@ -1,11 +1,11 @@
 ### s48_create_build_dirs.m4 --- S48_CREATE_BUILD_DIRS macro  -*- Autoconf -*-
-# serial 1
+# serial 2
 dnl
 AC_DEFUN([S48_CREATE_BUILD_DIRS], [dnl
-        mkdir -p c/bibop
-        mkdir -p c/unix
-	mkdir -p c/net
-        mkdir -p c/posix
-        mkdir -p c/fake
+AC_CONFIG_COMMANDS([c/bibop],   [mkdir -p c/bibop])
+AC_CONFIG_COMMANDS([c/unix],    [mkdir -p c/unix])
+AC_CONFIG_COMMANDS([c/net],     [mkdir -p c/net])
+AC_CONFIG_COMMANDS([c/posix],   [mkdir -p c/posix])
+AC_CONFIG_COMMANDS([c/fake],    [mkdir -p c/fake])
 ])dnl
 ### s48_create_build_dirs.m4 ends here