Fix QA issues related to implicit declarations.

* QA Notice: Package triggers severe warnings which indicate that it
*            may exhibit random runtime failures.
* clmadjust.c:184:10: warning: implicit declaration of function ‘mcxFree’ [-Wimplicit-function-declaration]
* mcxi.c:42:16: warning: implicit declaration of function ‘isatty’ [-Wimplicit-function-declaration]

--- mcl-14-137/src/shcl/clmadjust.c
+++ mcl-14-137/src/shcl/clmadjust.c
@@ -14,6 +14,7 @@
 #include "report.h"
 #include "clmadjust.h"
 
+#include "util/alloc.h"
 #include "util/io.h"
 #include "util/types.h"
 #include "util/err.h"
--- mcl-14-137/src/shmcx/mcxi.c
+++ mcl-14-137/src/shmcx/mcxi.c
@@ -8,6 +8,7 @@
 */
 
 #include <stdio.h>
+#include <unistd.h>
 
 #include "stack.h"
 #include "glob.h"