pegtl: Fix build with clang/libc++

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Cc: Ayoub Zaki <ayoub.zaki@embexus.com>

meta-oe/recipes-extended/pegtl/pegtl/0001-Fix-clang-warning-about-non-virtual-dtor.patch

@@ -0,0 +1,25 @@
+From 340110292b35d367205953a59e7eab28e1f4a0bb Mon Sep 17 00:00:00 2001
+From: Daniel Frey <d.frey@gmx.de>
+Date: Sat, 7 Apr 2018 09:13:51 +0200
+Subject: [PATCH] Fix clang-warning about non-virtual dtor
+
+Upstream-Status: Backport [https://github.com/taocpp/PEGTL/commit/340110292b35d367205953a59e7eab28e1f4a0bb]
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+---
+ src/example/pegtl/json_classes.hpp | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+--- a/src/example/pegtl/json_classes.hpp
++++ b/src/example/pegtl/json_classes.hpp
+@@ -34,10 +34,7 @@ namespace examples
+          : type( in_type )
+       {
+       }
+-
+-      ~json_base()
+-      {
+-      }
++      virtual ~json_base() = default;
+    };
+ 
+    inline std::ostream& operator<<( std::ostream& o, const json_base& j )

meta-oe/recipes-extended/pegtl/pegtl_2.1.4.bb

@@ -4,7 +4,9 @@ LICENSE="MIT"
 LIC_FILES_CHKSUM = "file://LICENSE;md5=80cb066ab204c7fe022f1cfe0c2c6818"
 
 SRCREV = "776fa4a1e8bda860008524f6dd9473967c8375b1"
-SRC_URI = "git://git@github.com/taocpp/PEGTL.git;protocol=https;branch=master"
+SRC_URI = "git://git@github.com/taocpp/PEGTL.git;protocol=https;branch=master \
+           file://0001-Fix-clang-warning-about-non-virtual-dtor.patch \
+          "
 
 inherit cmake