Remove the config.h kludge and override vasprintf detection via HAVE_VASPRINTF.

lib/external/dewey.c

@@ -37,9 +37,6 @@
 #include <ctype.h>
 
 #include "xbps_api_impl.h"
-#ifdef HAVE_CONFIG_H
-#include "config.h"
-#endif
 
 #define PKG_PATTERN_MAX 1024
 

lib/external/fexec.c

@@ -29,13 +29,15 @@
 
 #define _BSD_SOURCE	/* for vfork and chroot */
 #include <sys/types.h>
+#include <unistd.h>
+
 #include <sys/wait.h>
 #include <errno.h>
 #include <stdarg.h>
 #include <stdlib.h>
 #include <string.h>
-#include <unistd.h>
 
+#undef _BSD_SOURCE
 #include "xbps_api_impl.h"
 
 static int