Configure fix and warning fix for Go

Source/Modules/go.cxx

@@ -6314,7 +6314,7 @@ private:
 
     String *ct = Getattr(n, "emit:cgotype");
     if (ct) {
-      *c_struct_type = (bool)Getattr(n, "emit:cgotypestruct");
+      *c_struct_type = Getattr(n, "emit:cgotypestruct") ? true : false;
       return Copy(ct);
     }
 

configure.ac

@@ -2333,8 +2333,6 @@ else
     GO="$GOBIN"
   fi
 
-  AC_CHECK_PROGS(GCCGO, gccgo)
-
   GOGCC=false
   GCCGO=
   GO1=false
@@ -2345,6 +2343,7 @@ else
   GCCGOOPT=
   GOVERSIONOPTION=
 
+  if test -n "$GO" ; then
     GO1=true
     GOVERSIONOPTION=version
     GOC=$(sh -c "$(go env) && echo \$GOCHAR")c
@@ -2379,7 +2378,11 @@ else
       GO15=true
       ;;
     esac
+  fi
 
+  AC_CHECK_PROGS(GCCGO, gccgo)
+
+  if test -n "$GCCGO" ; then
     if $GCCGO --help 2>/dev/null | grep gccgo >/dev/null 2>&1 ; then
       AC_MSG_CHECKING([whether gccgo version is too old])
       go_version=[`$GO $GOVERSIONOPTION | sed -n '1p' | sed -e 's/^.* \([0-9.]*\) *$/\1/' -e 's/[.]//g'`]
@@ -2404,6 +2407,7 @@ else
       fi
     fi
   fi
+fi
 
 AC_SUBST(GOGCC)
 AC_SUBST(GCCGO)