Include the standard stdlib.h instead of the nonstandard malloc.h which
does not exist on macOS.

https://sourceforge.net/p/aa-project/bugs/4/
https://sourceforge.net/p/aa-project/bugs/7/
--- src/aados.c.orig	2001-04-26 09:37:31.000000000 -0500
+++ src/aados.c	2020-09-22 02:41:31.000000000 -0500
@@ -5,7 +5,7 @@
 #include <go32.h>
 #include <dpmi.h>
 #include <sys/nearptr.h>
-#include <malloc.h>
+#include <stdlib.h>
 #include "aalib.h"
 #include "aaint.h"
 int __use_nearptr_hack;
--- src/aadoskbd.c.orig	2001-04-26 09:37:31.000000000 -0500
+++ src/aadoskbd.c	2020-09-22 02:42:30.000000000 -0500
@@ -4,7 +4,6 @@
 #include <go32.h>
 #include <dpmi.h>
 #include <sys/nearptr.h>
-#include <malloc.h>
 #include <stdlib.h>
 #include <dos.h>
 #include <dpmi.h>
--- src/aaedit.c.orig	2001-04-26 09:37:31.000000000 -0500
+++ src/aaedit.c	2020-09-22 02:41:31.000000000 -0500
@@ -1,6 +1,6 @@
 #include <string.h>
 #include <ctype.h>
-#include <malloc.h>
+#include <stdlib.h>
 #include "aalib.h"
 #include "aaint.h"
 static void aa_editdisplay(struct aa_edit *e)
--- src/aakbdreg.c.orig	2001-04-26 09:37:31.000000000 -0500
+++ src/aakbdreg.c	2020-09-22 02:41:31.000000000 -0500
@@ -1,4 +1,4 @@
-#include <malloc.h>
+#include <stdlib.h>
 #include "config.h"
 #include "aalib.h"
 #include "aaint.h"
--- src/aalib.c.orig	2001-04-26 09:37:31.000000000 -0500
+++ src/aalib.c	2020-09-22 02:41:31.000000000 -0500
@@ -1,6 +1,6 @@
 #include <stdio.h>
 #include <string.h>
-#include <malloc.h>
+#include <stdlib.h>
 #include "aalib.h"
 #include "aaint.h"
 
--- src/aalinux.c.orig	2001-04-26 09:43:56.000000000 -0500
+++ src/aalinux.c	2020-09-22 02:42:12.000000000 -0500
@@ -1,7 +1,6 @@
 #include "config.h"
 #ifdef LINUX_DRIVER
 #include <sys/stat.h>
-#include <malloc.h>
 #include <sys/ioctl.h>
 #include <linux/kd.h>
 #ifdef GPM_MOUSEDRIVER
--- src/aamoureg.c.orig	2001-04-26 09:37:31.000000000 -0500
+++ src/aamoureg.c	2020-09-22 02:41:31.000000000 -0500
@@ -1,4 +1,4 @@
-#include <malloc.h>
+#include <stdlib.h>
 #include "config.h"
 #include "aalib.h"
 #include "aaint.h"
--- src/aarec.c.orig	2001-04-26 09:37:31.000000000 -0500
+++ src/aarec.c	2020-09-22 02:41:31.000000000 -0500
@@ -1,5 +1,5 @@
 #include <string.h>
-#include <malloc.h>
+#include <stdlib.h>
 #include "aalib.h"
 #include "aaint.h"
 aa_linkedlist *aa_kbdrecommended = NULL, *aa_mouserecommended = NULL,
--- src/aaregist.c.orig	2001-04-26 09:37:31.000000000 -0500
+++ src/aaregist.c	2020-09-22 02:41:31.000000000 -0500
@@ -1,4 +1,4 @@
-#include <malloc.h>
+#include <stdlib.h>
 #include "config.h"
 #include "aalib.h"
 #include "aaint.h"
--- src/aax.c.orig	2001-04-26 09:37:54.000000000 -0500
+++ src/aax.c	2020-09-22 02:42:17.000000000 -0500
@@ -1,4 +1,3 @@
-#include <malloc.h>
 #include <stdlib.h>
 #include <string.h>
 #include <stdio.h>
--- src/aaxkbd.c.orig	2001-04-26 09:37:31.000000000 -0500
+++ src/aaxkbd.c	2020-09-22 02:42:27.000000000 -0500
@@ -1,4 +1,3 @@
-#include <malloc.h>
 #include <stdlib.h>
 #include <string.h>
 #include <stdio.h>
--- src/aaxmouse.c.orig	2001-04-26 09:37:31.000000000 -0500
+++ src/aaxmouse.c	2020-09-22 02:42:34.000000000 -0500
@@ -1,4 +1,3 @@
-#include <malloc.h>
 #include <stdlib.h>
 #include <string.h>
 #include <stdio.h>