[Buildroot] [git commit] package/libfreeimage: fix build with gcc 11

commit: https://git.buildroot.net/buildroot/commit/?id=b4f0a0d603176b45e52d7d6e695af269a356f413
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/master

Fix the following build failure with gcc 11:

In file included from Source/FreeImage/../OpenEXR/IlmImf/ImfHeader.h:51,
                 from Source/FreeImage/../OpenEXR/IlmImf/ImfOutputFile.h:46,
                 from Source/FreeImage/PluginEXR.cpp:33:
Source/OpenEXR/Imath/ImathVec.h:228:41: error: ISO C++17 does not allow dynamic exception specifications
  228 |     const Vec2 &        normalizeExc () throw (IEX_NAMESPACE::MathExc);
      |                                         ^~~~~

Fixes:
 - http://autobuild.buildroot.org/results/953cd07402fe2f99f2361a3b4a7b086a88e0d72d

Signed-off-by: Fabrice Fontaine <redacted>
Signed-off-by: Yann E. MORIN <redacted>
---
 package/libfreeimage/libfreeimage.mk | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/package/libfreeimage/libfreeimage.mk b/package/libfreeimage/libfreeimage.mk
index 91299084a1..4775f92109 100644
--- a/package/libfreeimage/libfreeimage.mk
+++ b/package/libfreeimage/libfreeimage.mk

@@ -20,7 +20,8 @@ define LIBFREEIMAGE_EXTRACT_CMDS
 endef
 
 define LIBFREEIMAGE_BUILD_CMDS
-	$(TARGET_MAKE_ENV) $(TARGET_CONFIGURE_OPTS) $(MAKE) -C $(@D)
+	$(TARGET_MAKE_ENV) $(TARGET_CONFIGURE_OPTS) \
+		CXXFLAGS="$(TARGET_CXXFLAGS) -std=c++11" $(MAKE) -C $(@D)
 endef
 
 define LIBFREEIMAGE_INSTALL_STAGING_CMDS

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