Minix editline v0.1.3

=====================

Fix another build warning for Arm cross-gcc, which actually was v4.1.2
This time getpid() was missing unistd.h, but kill() was also missing 
signal.h.  Added test for signal.h, but left out unistd.h since we
already define SYS_UNIX -- which we should really check for instead...

The rest are cosmetic prototype or automake/autoconf fixes.

src/editline.c

@@ -1119,7 +1119,7 @@ find_word()
 }
 
 STATIC STATUS
-c_possible()
+c_possible(void)
 {
     CHAR	**av;
     CHAR	*word;
@@ -1140,7 +1140,7 @@ c_possible()
 }
 
 STATIC STATUS
-c_complete()
+c_complete(void)
 {
     CHAR	*p, *q;
     CHAR	*word, *new;