[Buildroot] [PATCH 1/1] package/duma: fix build with gcc 11

Fix the following build failure with gcc 11:

In file included from dumapp.cpp:39:
dumapp.h:88:49: error: ISO C++17 does not allow dynamic exception specifications
   88 |     void * DUMA_CDECL operator new(DUMA_SIZE_T) throw(std::bad_alloc);
      |                                                 ^~~~~

While at it, also drop DUMA_CPP which does not seem to be set since the
addition of the package back in 2013 in commit
bda69bf4e4b642ab199ffa13c7356709885f129d

Fixes:
 - http://autobuild.buildroot.org/results/ed838a55f09841a643b05e5a7a7ca0a9d2882acd

Signed-off-by: Fabrice Fontaine <redacted>
---
 package/duma/duma.mk | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/package/duma/duma.mk b/package/duma/duma.mk
index 0e8a623bde..906db872d5 100644
--- a/package/duma/duma.mk
+++ b/package/duma/duma.mk

@@ -21,7 +21,7 @@ define DUMA_BUILD_CMDS
 	$(TARGET_MAKE_ENV) $(MAKE1) $(TARGET_CONFIGURE_OPTS) \
 		OS=linux \
 		DUMA_OPTIONS="$(DUMA_OPTIONS)" \
-		$(DUMA_CPP) -C $(@D)
+		CPPFLAGS="$(TARGET_CXXFLAGS) -std=c++11" -C $(@D)
 endef
 
 define DUMA_INSTALL_STAGING_CMDS

-- 
2.30.2

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