ncurses specify -DXOPEN_SOURCE values in its .pc files, break third-party applications

[Francois Tigeot]

Hi,

I recently tried to build a recent version of qemu on a DragonFly system.
The compilation failed due to a missing O_CLOEXEC definition.

This was not very surprising given qemu used -D_POSIX_C_SOURCE=200112L
-D_XOPEN_SOURCE=600 in its compilation flags, preventing features more
recent than the old X/Open 6 standard from being made available.

Now, qemu uses ncurses and these flags came from the ncurses .pc pkgconfig
files.

The attached configure patch fixed the issue for me.

-- 
Francois Tigeot

patch-configure.txt
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