Fix crash (and compiler warnings)

[Upstream: opsengine#48]
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

Author: tripplet

src/cpulimit.c

@@ -43,7 +43,7 @@
 #include <sys/types.h>
 #include <sys/wait.h>
 
-#ifdef __APPLE__ || __FREEBSD__
+#if defined(__APPLE__) || defined(__FREEBSD__)
 #include <libgen.h>
 #endif
 

src/process_group.c

@@ -25,6 +25,10 @@
 #include <sys/time.h>
 #include <signal.h>
 
+#if defined(__APPLE__) || defined(__FREEBSD__)
+#include <libgen.h>
+#endif
+
 #include <assert.h>
 
 #include "process_iterator.h"

tests/process_iterator_test.c

@@ -28,7 +28,7 @@
 #include <signal.h>
 #include <string.h>
 
-#ifdef __APPLE__ || __FREEBSD__
+#if defined(__APPLE__) || defined(__FREEBSD__)
 #include <libgen.h>
 #endif