This reverts commit 84315b6bfc5fdc5fe631f29d85113b52abb2936a.
Turns out it wasn't harmless, and it breaks mac OS. Instead of adding
platform checks here, this flag is now included in the cygwin-specific
parts of the bitlbee pkg-config file, as of bitlbee commit b9c10a1a
(version string 3.5.1+20170529+develop+18-gb9c10a1a-git)
This reverts commit 84315b6bfc5fdc5fe631f29d85113b52abb2936a.
Turns out it wasn't harmless, and it breaks mac OS. Instead of adding platform checks here, this flag is now included in the cygwin-specific parts of the bitlbee pkg-config file, as of bitlbee commit b9c10a1a (version string 3.5.1+20170529+develop+18-gb9c10a1a-git)
Sorry for the noise.