[PATCH 19.07] tools/mklibs: Fix compile with GCC 11

[Hauke Mehrtens]

GCC 11 defaults to C++17, but mklibs does not compile when using the
C++17 standard. This patch switches back to the gnu++98 version like
done in master commit 9437012b9ee4 ("tools/mklibs: update to 0.1.44 and
convert to Python 3")

This fixes the following compile error message:
elf.hpp:52:56: error: ISO C++17 does not allow dynamic exception specifications
   52 |       const section &get_section(unsigned int i) const throw (std::out_of_range) { return *sections.at(i); };

Signed-off-by: Hauke Mehrtens <hauke at hauke-m.de>
---
 tools/mklibs/Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/mklibs/Makefile b/tools/mklibs/Makefile
index 507c2fd394..8826840524 100644
--- a/tools/mklibs/Makefile
+++ b/tools/mklibs/Makefile
@@ -18,6 +18,7 @@ HOST_FIXUP:=autoreconf
 include $(INCLUDE_DIR)/host-build.mk
 
 HOST_CFLAGS += -I$(CURDIR)/include
+HOST_CPPFLAGS += -std=gnu++98
 
 define Host/Install
        $(INSTALL_BIN) \
-- 
2.30.2