Drop -ansi from CXXFLAGS because it is actually a synonym for enforcing -std=c++98.

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>

acinclude.m4.in

@@ -3129,7 +3129,7 @@ AC_DEFUN([AC_CHECK_COMPILERS],
         case $host in
           *-*-linux-gnu)	
             CFLAGS="-W -Wall -Wchar-subscripts -Wshadow -Wpointer-arith -Wmissing-prototypes -Wwrite-strings -D_DEFAULT_SOURCE $CFLAGS"
-            CXXFLAGS="-ansi -D_DEFAULT_SOURCE -Wcast-align -Wchar-subscripts $CXXFLAGS"
+            CXXFLAGS="-D_DEFAULT_SOURCE -Wcast-align -Wchar-subscripts $CXXFLAGS"
             KDE_CHECK_COMPILER_FLAG(Wmissing-format-attribute, [CXXFLAGS="$CXXFLAGS -Wformat-security -Wmissing-format-attribute"])
             KDE_CHECK_C_COMPILER_FLAG(Wmissing-format-attribute, [CFLAGS="$CFLAGS -Wformat-security -Wmissing-format-attribute"])
           ;;