unix-ffi/_libc/_libc.py: Extend FreeBSD libc versions range.

This commit adds support for more recent versions of FreeBSD to the
_libc module.

FreeBSD bumped up the major version of its libc library around
14.1-RELEASE, and the _libc module wasn't updated to keep track of this
change.  The current version of FreeBSD at the time of this commit is
15.0-RELEASE, so this change should unlock support for two major
versions of the OS in question.

This change might also work with other BSD-derived OSes, but it wasn't
tested on those systems.

This fixes #962.

Signed-off-by: Alessandro Gatti <a.gatti@frob.it>

Author: agatti

unix-ffi/_libc/_libc.py

@@ -4,7 +4,7 @@
 
 _h = None
 
-names = ("libc.so", "libc.so.0", "libc.so.6", "libc.dylib")
+names = ("libc.so", "libc.so.0", "libc.so.6", "libc.so.7", "libc.dylib")
 
 
 def get():