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2018-06-03T14:47:12.749206Z
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V 735
MFH: r471197

mail/mailsync: Fix build with Clang 6.0.0

exit function declared in autoconf 2.59 configure scripts conflicts
with Clang 6 because stdlib.h declares it with an attribute for C++11
or later. This is fixed in later versions of autoconf 2.60.

- Add USES=autoreconf to regenerate configure, new version of
  autoconf no longer declares the exit function. [1]
- Merge the changes from files/patch-configure and post-patch taget
  into acinclude/ac_with_{cclient,openssl}.m4

[1] http://git.savannah.gnu.org/cgit/autoconf.git/commit/?id=a71c24a704ec0570ba99be909fffbc044d50908b

Reviewed by:	koobs, mat
Approved by:	koobs (mentor)
Differential Revision:	https://reviews.freebsd.org/D15532

Approved by:	ports-secteam (riggs)

END