[Bug 206169] Mk/Uses/cmake.mk THREADS_HAVE_PTHREAD_ARG issue

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=206169

            Bug ID: 206169
           Summary: Mk/Uses/cmake.mk THREADS_HAVE_PTHREAD_ARG issue
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Ports Framework
          Assignee: portmgr at FreeBSD.org
          Reporter: brnrd at freebsd.org
                CC: freebsd-ports-bugs at FreeBSD.org

Mk/Uses/cmake.mk line 82 adds a CMake argument

> -DTHREADS_HAVE_PTHREAD_ARG:BOOL=YES

This causes cmake to add -pthread to the depends list in stead of -lpthread.

If I remove the offending line in cmake.mk I get a proper -lpthread in the
CMakeCache.txt

This was discovered after the build of MariaDB 10.1 review D3953 that uses the
dependencies to provide a mysql_config command that can be used by ports
depending on the libmysqlclient library to set proper build flags (e.g.
mail/dovecot2)

CMakeCache.out original
> //Dependencies for the target
> mysqlclient_LIB_DEPENDS:STATIC=general;-pthread;general;-pthread;general;/usr/lib/libz.so;general;m
CMakeCache.out after removing the line
> mysqlclient_LIB_DEPENDS:STATIC=general;-lpthread;general;-lpthread;general;/usr/lib/libz.so;general;m

mysql_config output
> -L/usr/local/lib/mysql  -lmysqlclient -l-pthread -lz -lm -lexecinfo -lssl -lcrypto

desired output
> -L/usr/local/lib/mysql  -lmysqlclient -lpthread -lz -lm -lexecinfo -lssl -lcrypto

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