canonicalize-lgpl: update for relocatable

[Bruno Haible]

The install-reloc script, when creating a wrapper program, compiles a few
selected source files directly. Whereas the program not necessarily needs
these as object files. For example, GNU hello doesn't need an
  AC_LIBOBJ([canonicalize-lgpl])
but the install-reloc script compiles canonicalize-lgpl.c.

This leads to a few new autoconf macros. Here is the first one:


2007-03-03  Bruno Haible  <address@hidden>

        * m4/canonicalize-lgpl.m4 (gl_CANONICALIZE_LGPL_SEPARATE): New macro.

*** m4/canonicalize-lgpl.m4     6 Nov 2006 18:21:35 -0000       1.1
--- m4/canonicalize-lgpl.m4     3 Mar 2007 19:22:06 -0000
***************
*** 1,5 ****
! # canonicalize-lgpl.m4 serial 3
! dnl Copyright (C) 2003, 2006 Free Software Foundation, Inc.
  dnl This file is free software; the Free Software Foundation
  dnl gives unlimited permission to copy and/or distribute it,
  dnl with or without modifications, as long as this notice is preserved.
--- 1,5 ----
! # canonicalize-lgpl.m4 serial 4
! dnl Copyright (C) 2003, 2006-2007 Free Software Foundation, Inc.
  dnl This file is free software; the Free Software Foundation
  dnl gives unlimited permission to copy and/or distribute it,
  dnl with or without modifications, as long as this notice is preserved.
***************
*** 18,23 ****
--- 18,32 ----
    fi
  ])
  
+ # Like gl_CANONICALIZE_LGPL, except prepare for separate compilation
+ # (no AC_LIBOBJ).
+ AC_DEFUN([gl_CANONICALIZE_LGPL_SEPARATE],
+ [
+   AC_CHECK_DECLS_ONCE(canonicalize_file_name)
+   AC_CHECK_FUNCS_ONCE(canonicalize_file_name)
+   gl_PREREQ_CANONICALIZE_LGPL
+ ])
+ 
  # Prerequisites of lib/canonicalize-lgpl.c.
  AC_DEFUN([gl_PREREQ_CANONICALIZE_LGPL],
  [