Work around wrong vsscanf() declaration under HP-UX.

Under this system vsscanf() is declared as taking a non-const char* as first
argument which prevented our code using it from compiling. Wrap it in
wxCRT_VsscanfA() adding the necessary const_cast<> to fix this.

Closes #15638.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@75340 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

configure

@@ -29994,6 +29994,54 @@ $as_echo "$wx_cv_func_vsscanf_decl" >&6; }
     if test "$wx_cv_func_vsscanf_decl" = "yes"; then
         $as_echo "#define HAVE_VSSCANF_DECL 1" >>confdefs.h
 
+
+                                { $as_echo "$as_me:${as_lineno-$LINENO}: checking if vsscanf() declaration is broken" >&5
+$as_echo_n "checking if vsscanf() declaration is broken... " >&6; }
+if ${wx_cv_func_broken_vsscanf_decl+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+
+                cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+                        #include <stdio.h>
+                        #include <stdarg.h>
+                        #ifdef __MSL__
+                        #if __MSL__ >= 0x6000
+                        namespace std {}
+                        using namespace std;
+                        #endif
+                        #endif
+
+int
+main ()
+{
+
+                        const char *buf;
+                        va_list args;
+                        vsscanf(buf, "%s", args);
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_cxx_try_compile "$LINENO"; then :
+  wx_cv_func_broken_vsscanf_decl=no
+else
+  wx_cv_func_broken_vsscanf_decl=yes
+
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+
+
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $wx_cv_func_broken_vsscanf_decl" >&5
+$as_echo "$wx_cv_func_broken_vsscanf_decl" >&6; }
+
+        if test "$wx_cv_func_broken_vsscanf_decl" = "yes"; then
+            $as_echo "#define HAVE_BROKEN_VSSCANF_DECL 1" >>confdefs.h
+
+        fi
     fi
 fi
 ac_ext=c