blaze_util_freebsd.cc: include path.h explicitly

...as this file uses blaze_util::JoinPath. Apparently, until
recently, that header file was pulled in indirectly, so that
this wasn't detected until now. Nevertheless, the header files
for functions used directly should also be included explicitly
anyway.

Change-Id: Id181480c6ec7fd146ce8b7b00980319f13c3f518
PiperOrigin-RevId: 203445044

src/main/cpp/blaze_util_freebsd.cc

@@ -33,6 +33,7 @@
 #include "src/main/cpp/util/exit_code.h"
 #include "src/main/cpp/util/file.h"
 #include "src/main/cpp/util/logging.h"
+#include "src/main/cpp/util/path.h"
 #include "src/main/cpp/util/port.h"
 #include "src/main/cpp/util/strings.h"