gnulib-tool update

[Eric Blake]

gnulib-tool has changed again.  Without this patch, a fresh checkout would pull 
in the unnecessary onceonly_2_57.m4.  Applying to both branch and head:

2006-07-20  Eric Blake  <address@hidden>

        * m4/gnulib-cache.m4: gnulib-tool has changed again.  Regenerate
        to explicitly ask for --assume-autoconf=2.60.

Index: m4/gnulib-cache.m4
===================================================================
RCS file: /sources/m4/m4/m4/Attic/gnulib-cache.m4,v
retrieving revision 1.1.2.6
diff -u -r1.1.2.6 gnulib-cache.m4
--- m4/gnulib-cache.m4  13 Jul 2006 12:50:47 -0000      1.1.2.6
+++ m4/gnulib-cache.m4  20 Jul 2006 15:38:07 -0000
@@ -15,7 +15,7 @@
 
 
 # Specification in the form of a command-line invocation:
-#   gnulib-tool --import --dir=. --lib=libm4 --source-base=lib --m4-base=m4 --
doc-base=doc --aux-dir=. --macro-prefix=M4 alloca binary-io error fdl gendocs 
getopt mkstemp obstack regex strtol xalloc xvasprintf
+#   gnulib-tool --import --dir=. --lib=libm4 --source-base=lib --m4-base=m4 --
doc-base=doc --aux-dir=. --macro-prefix=M4 --assume-autoconf=2.60 alloca binary-
io error fdl gendocs getopt mkstemp obstack regex strtol xalloc xvasprintf
 
 # Specification in the form of a few gnulib-tool.m4 macro invocations:
 gl_MODULES([alloca binary-io error fdl gendocs getopt mkstemp obstack regex 
strtol xalloc xvasprintf])
@@ -26,3 +26,4 @@
 gl_TESTS_BASE([tests])
 gl_LIB([libm4])
 gl_MACRO_PREFIX([M4])
+gl_AUTOCONF_MINVERSION([2.60])