Review system() dependencies and clean up obsolete function prototypes in spawn interface.

exec.c

@@ -82,15 +82,6 @@ static int dobuf( struct buffer *bp) ;
 static void freewhile( struct while_block *wp) ;
 static int macarg( char *tok, int toksz) ;
 
-void ue_system( const char *cmd) {
-    int ret ;
-
-    ret = system( cmd) ;
-    if( ret == -1) {
-    /* some actual handling needed here */
-    }
-}
-
 /*
  * Execute a named command even if it is not bound.
  */

exec.h

@@ -15,7 +15,6 @@ int execproc( int f, int n) ;
 extern boolean clexec ;	/* command line execution flag  */
 
 
-void ue_system( const char *cmd) ;
 int namedcmd( int f, int n) ;
 int execcmd( int f, int n) ;
 void gettoken( char *tok, int maxtoksize) ;

input.c

@@ -11,6 +11,7 @@
  */
 
 #include <stdio.h>
+#include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
 
@@ -50,6 +51,15 @@ const int nlc = CONTROL | 'J' ;		/* end of input char */
 static const int quotec = 0x11 ;	/* quote char during getstring()	 */
 
 
+void ue_system( const char *cmd) {
+    int ret ;
+
+    ret = system( cmd) ;
+    if( ret == -1) {
+    /* some actual handling needed here */
+    }
+}
+
 /*
  * Ask a yes or no question in the message line. Return either TRUE, FALSE, or
  * ABORT. The ABORT status is returned if the user bumps out of the question

input.h

@@ -21,6 +21,7 @@ extern int abortc;		/* current abort command char   */
 extern const int nlc ;	/* end of input char */
 
 
+void ue_system( const char *cmd) ;
 int mlyesno( const char *prompt) ;
 int newmlarg( char **outbufref, const char *prompt, int size) ;
 int newmlargt( char **outbufref, const char *prompt, int size) ;

spawn.h

@@ -5,7 +5,3 @@ int spawn( int f, int n) ;
 int execprg( int f, int n) ;
 int pipecmd( int f, int n) ;
 int filter_buffer( int f, int n) ;
-int sys( char *cmd) ;
-int shellprog( char *cmd) ;
-int execprog( char *cmd) ;
-