Merge #10136: build: Disable Wshadow warning

2c83911 build: Disable Wshadow warning (Wladimir J. van der Laan)

Tree-SHA512: e3c1f7253c43449740760da287985b8027344dfc48c8a85ea9bca977c73cbaf75709d6e32ac0fea51eb89dccb48706a5abdf006be45375838df10ccba35e9aa1

Author: laanwj

configure.ac

@@ -227,7 +227,6 @@ if test "x$CXXFLAGS_overridden" = "xno"; then
   AX_CHECK_COMPILE_FLAG([-Wformat],[CXXFLAGS="$CXXFLAGS -Wformat"],,[[$CXXFLAG_WERROR]])
   AX_CHECK_COMPILE_FLAG([-Wvla],[CXXFLAGS="$CXXFLAGS -Wvla"],,[[$CXXFLAG_WERROR]])
   AX_CHECK_COMPILE_FLAG([-Wformat-security],[CXXFLAGS="$CXXFLAGS -Wformat-security"],,[[$CXXFLAG_WERROR]])
-  AX_CHECK_COMPILE_FLAG([-Wshadow],[CXXFLAGS="$CXXFLAGS -Wshadow"],,[[$CXXFLAG_WERROR]])
 
   ## Some compilers (gcc) ignore unknown -Wno-* options, but warn about all
   ## unknown options if any other warning is produced. Test the -Wfoo case, and