patch 9.0.0834: warning for missing return type

Problem:    Warning for missing return type.
Solution:   Add "int". (San James, closes #11496)

src/auto/configure

@@ -12420,7 +12420,7 @@ cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 
 #include <signal.h>
-test_sig()
+int test_sig()
 {
     struct sigcontext *scont;
     scont = (struct sigcontext *)0;

src/configure.ac

@@ -3654,7 +3654,7 @@ dnl check if struct sigcontext is defined (used for SGI only)
 AC_MSG_CHECKING(for struct sigcontext)
 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([
 #include <signal.h>
-test_sig()
+int test_sig()
 {
     struct sigcontext *scont;
     scont = (struct sigcontext *)0;

src/version.c

@@ -695,6 +695,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    834,
 /**/
     833,
 /**/