Add -Wunreachable-code

Reference:
https://github.com/dajobe/librdf/commit/45cafb31

Signed-off-by: caofei <caofei@xfusion.com>

0001-Add-Wunreachable-code.patch

@@ -0,0 +1,24 @@
+From 45cafb3157d74a8ac718a9278ae88da841d5c647 Mon Sep 17 00:00:00 2001
+From: Dave Beckett <dave@dajobe.org>
+Date: Thu, 27 Feb 2014 09:38:02 -0600
+Subject: [PATCH] Add -Wunreachable-code
+
+---
+ configure.ac | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/configure.ac b/configure.ac
+index b7b220ae..15def330 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -233,6 +233,7 @@ possible_warnings="\
+ -Wstrict-prototypes \
+ -Wswitch-enum \
+ -Wundef \
++-Wunreachable-code \
+ -Wunsafe-loop-optimizations \
+ -Wwrite-strings \
+ \
+-- 
+2.33.0
+

redland.spec

@@ -1,12 +1,13 @@
 Name:           redland
 Version:        1.0.17
-Release:        19
+Release:        20
 Summary:        RDF iprovids support for the Resource Description Framework.
 License:        LGPLv2+ or ASL 2.0
 URL:            http://librdf.org/
 Source0:        http://download.librdf.org/source/%{name}-%{version}.tar.gz
 
 Patch0:         0001-Fix-unreachable-codes-break-after-return-mostly.patch
+Patch6000:      0001-Add-Wunreachable-code.patch
 
 BuildRequires:  curl-devel gcc-c++ libdb-devel libtool-ltdl-devel libxml2-devel >= 2.4.0 mysql-devel
 BuildRequires:  perl-interpreter postgresql-devel raptor2-devel rasqal-devel >= 0.9.26 
@@ -114,6 +115,9 @@ make check
 
 
 %changelog
+* Tue Jul 18 2023 caofei <caofei@xfusion.com> -   1.0.17-20
+- Add -Wunreachable-code
+
 * Tue Jan 17 2023 caofei <caofei@xfusion.com> -   1.0.17-19
 - Fix unreachable codes - break after return mostly