testsuite fails to build with Autoconf 2.62

[Ralf Wildenhues]

Hello,

I get this when trying to test Libtool with Autoconf 2.62:

getopt-m4sh.at:114: error: m4_divert_pop(TEST_SCRIPT): diversion mismatch: 
getopt-m4sh.at:103: m4_divert_push: GROW
getopt-m4sh.at:100: m4_divert_push: TEST_SCRIPT
getopt-m4sh.at:100: m4_divert_push: TEST_GROUPS
testsuite.at:445: m4_divert_push: KILL
../../../autoconf-2.62/lib/m4sugar/m4sh.m4:797: AS_ECHO is expanded from...
getopt-m4sh.at:114: the top level
autom4te: /home/ralf/local/bin/m4 failed with exit status: 1

Seems to work with 2.64, however.  I have no idea which Autoconf change
is relevant here, or what needs to be fixed in Libtool.

Thanks,
Ralf