pthread missing for building in FreeBSD

[pittagurneyi]

The following was necessary to successfully build cx_Freeze in FreeBSD:

--- setup.py.orig	2023-11-26 22:54:18.026772000 +0000
+++ setup.py	2023-11-26 22:55:26.687658000 +0000
@@ -52,6 +52,8 @@
         library_dirs = ext.library_dirs or []
         libraries = self.get_libraries(ext)
         extra_args = ext.extra_link_args or []
+        if PLATFORM.startswith('freebsd'):
+            libraries.append('pthread')
         if IS_MINGW or IS_WINDOWS:
             compiler_type = self.compiler.compiler_type
             # support for delay load [windows]

Please patch it in the next version, so we can stop manually doing so in the FreeBSD port.

Thanks!

[marcelotduarte]

Release 6.15.11 is out!