Update Makefile

* Set CC as clang for FreeBSD 10
Merge branch 'jj1bdx-freebsd-10' into jj1bdx-freebsd-10-dev

* wcwidth.c conditional compilation fix
Update wcwidth.c

* Remove redundant flag of _SYS__TYPES_H_
Update Makefile

* Enabled gcc as the default CC (as in the master branch)