[Buildroot] [PATCH 2/2] package/edid-decode: fix build with gcc <= 5

[Fabrice Fontaine <fontaine.fabrice@gmail.com>]

Pass -std=c++11 to fix the following build failure with gcc <= 5:

/tmp/instance-0/output-1/host/bin/mips64el-linux-g++ -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64  -Os       -Wall -Wextra -Wno-missing-field-initializers -Wno-unused-parameter -g -DSHA="not available" -o edid-decode edid-decode.cpp parse-base-block.cpp parse-cta-block.cpp parse-displayid-block.cpp parse-ls-ext-block.cpp parse-di-ext-block.cpp parse-vtb-ext-block.cpp -lm
edid-decode.cpp: In member function 'std::__cxx11::string edid_state::dtd_type()':
edid-decode.cpp:192:17: error: 'to_string' is not a member of 'std'
  unsigned len = std::to_string(preparse_total_dtds).length();
                 ^

Fixes:
 - http://autobuild.buildroot.org/results/71e4a50542c4551797f1d0404d27244612b427d7

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
---
 package/edid-decode/edid-decode.mk | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/package/edid-decode/edid-decode.mk b/package/edid-decode/edid-decode.mk
index c41a9f2a76..7e463c02b1 100644
--- a/package/edid-decode/edid-decode.mk
+++ b/package/edid-decode/edid-decode.mk
@@ -11,7 +11,7 @@ EDID_DECODE_LICENSE_FILES = LICENSE
 
 define EDID_DECODE_BUILD_CMDS
 	$(TARGET_MAKE_ENV) $(TARGET_CONFIGURE_OPTS) $(MAKE) -C $(@D) \
-		CFLAGS="$(TARGET_CXXFLAGS)"
+		CFLAGS="$(TARGET_CXXFLAGS) -std=c++11"
 endef
 
 define EDID_DECODE_INSTALL_TARGET_CMDS
-- 
2.26.2