K 10
svn:author
V 6
loader
K 8
svn:date
V 27
2018-05-31T08:41:44.338033Z
K 7
svn:log
V 698
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
MFH:		2018Q2

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