m4_ax_check_typedef.m4 fixes

stsp <[email protected]>
Newsgroups gmane.comp.sysutils.autoconf.bugs
Message-ID <[email protected]> 
Hi, I've found the m4_ax_check_typedef.m4 script here:
http://git.savannah.gnu.org/gitweb/?p=autoconf-archive.git;a=blob_plain;f=m4/ax_check_typedef.m4

It appears to be very buggy:
- actions are ignored
- if the header is omitted, then the printout is:
"Checking for type in  ..."
even though it actually checks in stddef.h.

Attached is the fixed version of a script.
m4_ax_check_typedef.m4 (application/x-m4, 2 KB) - not displayed
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