posix1e: Don't #include <sys/capability.h> on FreeBSD

The file is there by default, but deprecated and not a POSIX.1E
implementation.  While I'm at it, move the logic to posix1e.h so other
files aren't burdened with an extra include.

Fixes the other half of #40.

parse.c

@@ -22,6 +22,7 @@
 #include "exec.h"
 #include "expr.h"
 #include "mtab.h"
+#include "posix1e.h"
 #include "printf.h"
 #include "stat.h"
 #include "typo.h"

posix1e.h

@@ -19,6 +19,14 @@
 
 #include "bftw.h"
 #include "util.h"
+#include <stdbool.h>
+
+#if BFS_HAS_SYS_CAPABILITY && !__FreeBSD__
+#	include <sys/capability.h>
+#	ifdef CAP_CHOWN
+#		define BFS_HAS_POSIX1E_CAPABILITIES true
+#	endif
+#endif
 
 /**
  * Check if a file has a non-trvial Access Control List.

util.h

@@ -40,13 +40,6 @@
 #define BFS_HAS_SYS_PARAM      BFS_HAS_INCLUDE(<sys/param.h>, true)
 #define BFS_HAS_SYS_SYSMACROS  BFS_HAS_INCLUDE(<sys/sysmacros.h>, __GLIBC__)
 
-#if BFS_HAS_SYS_CAPABILITY
-#	include <sys/capability.h>
-#	ifdef CAP_CHOWN
-#		define BFS_HAS_POSIX1E_CAPABILITIES true
-#	endif
-#endif
-
 #if !defined(FNM_CASEFOLD) && defined(FNM_IGNORECASE)
 #	define FNM_CASEFOLD FNM_IGNORECASE
 #endif