package/grantlee: fix build with newer cmake

Fixes:
 - http://autobuild.buildroot.org/results/8cb0c153620be5765c098f05a2440fa1f3e4e2c2

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/grantlee/0001-Remove-vestigial-ansi-flag.patch

@@ -0,0 +1,27 @@
+From c989fcf192d01d26866faf6405a28ba4fdce64c3 Mon Sep 17 00:00:00 2001
+From: Stephen Kelly <steveire@gmail.com>
+Date: Sun, 21 Jul 2019 16:00:41 +0100
+Subject: [PATCH] Remove vestigial -ansi flag
+
+This causes the compiler to not operate in C++11 mode, meaning that
+headers such as <type_traits> issue errors.
+[Retrieved from:
+https://github.com/steveire/grantlee/commit/c989fcf192d01d26866faf6405a28ba4fdce64c3]
+Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+---
+ CMakeLists.txt | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 6d51110..9172213 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -59,7 +59,7 @@ endif()
+ 
+ if (CMAKE_COMPILER_IS_GNUCXX)
+   set (CMAKE_C_FLAGS   "${CMAKE_C_FLAGS} -Wno-long-long -std=iso9899:1990 -Wundef -Wcast-align -Werror-implicit-function-declaration -Wchar-subscripts -Wall -W -Wpointer-arith -Wwrite-strings -Wformat-security -Wmissing-format-attribute -fno-common")
+-  set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wnon-virtual-dtor -Wno-long-long -ansi -Wundef -Wcast-align -Wchar-subscripts -Wall -W -Wpointer-arith -Wformat-security -fno-check-new -fno-common ")
++  set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wnon-virtual-dtor -Wno-long-long -Wundef -Wcast-align -Wchar-subscripts -Wall -W -Wpointer-arith -Wformat-security -fno-check-new -fno-common ")
+ 
+   if (CMAKE_BUILD_TYPE MATCHES TestCocoon)
+     # Needed on 64 bit