Proposed commit log message:
mail/mailsync: Fix build with Clang 6.0.0
- Merge the changes from files/patch-configure and post-patch taget
into acinclude/ac_with_{cclient,openssl}.m4
- add USES=autoreconf to regenerate configure, new version of
autoconf no longer declears the exit function.
Reviewed_by: koobs
Approved by: koobs (mentor)
Differential_Revision:
MFH: 2018Q2