[sanitizer] Define __sanitizer_clockid_t on FreeBSD

[cryptoad]

Summary

https://reviews.llvm.org/D41121 broke the FreeBSD build due to that type not
being defined on FreeBSD. As far as I can tell, it is an int, but I do not have
a way to test the change.

[kparzysz]

It works.

lib/sanitizer_common/sanitizer_platform_limits_posix.h

 #if SANITIZER_FREEBSD
   typedef int __sanitizer_clock_t;
 #elif defined(__x86_64__) && !defined(_LP64)
   typedef long long __sanitizer_clock_t;
 #else
   typedef long __sanitizer_clock_t;
 #endif
 
-#if SANITIZER_LINUX
+#if SANITIZER_LINUX || SANITIZER_FREEBSD
   typedef int __sanitizer_clockid_t;
 #endif
 
 #if SANITIZER_LINUX || SANITIZER_FREEBSD
 #if defined(_LP64) || defined(__x86_64__) || defined(__powerpc__)\
                    || defined(__mips__)
   typedef unsigned __sanitizer___kernel_uid_t;
   typedef unsigned __sanitizer___kernel_gid_t;