Rationalised use of #includes to be more standards-compliant.

lang/pc/comp/LLlex.c

@@ -1,5 +1,8 @@
 /* L E X I C A L   A N A L Y S E R   F O R   I S O - P A S C A L */
 
+#include    <stdlib.h>
+#include    <stdio.h>
+#include    <string.h>
 #include	"debug.h"
 #include	"idfsize.h"
 #include	"numsize.h"

lang/pc/comp/code.c

@@ -1,5 +1,7 @@
 /* C O D E   G E N E R A T I O N   R O U T I N E S */
 
+#include    <stdlib.h>
+#include    <string.h>
 #include	"debug.h"
 #include	<assert.h>
 #include	<em.h>

lang/pc/comp/cstoper.c

@@ -1,5 +1,7 @@
 /* C O N S T A N T   E X P R E S S I O N   H A N D L I N G */
 
+#include    <stdlib.h>
+#include    <string.h>
 #include	"debug.h"
 #include	"target_sizes.h"
 

lang/pc/comp/input.c

@@ -1,5 +1,8 @@
 /* I N S T A N T I A T I O N   O F   I N P U T   P A C K A G E */
 
+#include    <stdlib.h>
+#include    <stdio.h>
+#include    <string.h>
 #include	"f_info.h"
 struct f_info	file_info;
 #include	"input.h"

lang/pc/comp/main.c

@@ -1,5 +1,7 @@
 /* M A I N   P R O G R A M */
 
+#include    <stdlib.h>
+#include    <string.h>
 #include	"debug.h"
 
 #include	<em.h>

lang/pc/comp/misc.c

@@ -1,5 +1,7 @@
 /* M I S C E L L A N E O U S    R O U T I N E S */
 
+#include    <stdlib.h>
+#include    <string.h>
 #include	<alloc.h>
 #include	<em.h>