remove unused u_printf_length.c

u_printf_length() was moved from u_printf.cpp to avoid a problem with
unused c++ sections with ld.bfd.

Since then, upstream changed u_printf.cpp to u_printf.c and this problem
no longer exists.

lib/mesa/src/util/u_printf_length.c

@@ -1,68 +0,0 @@
-//
-// Copyright 2020 Serge Martin
-//
-// Permission is hereby granted, free of charge, to any person obtaining a
-// copy of this software and associated documentation files (the "Software"),
-// to deal in the Software without restriction, including without limitation
-// the rights to use, copy, modify, merge, publish, distribute, sublicense,
-// and/or sell copies of the Software, and to permit persons to whom the
-// Software is furnished to do so, subject to the following conditions:
-//
-// The above copyright notice and this permission notice shall be included in
-// all copies or substantial portions of the Software.
-//
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
-// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
-// OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
-// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
-// OTHER DEALINGS IN THE SOFTWARE.
-//
-// Extract from Serge's printf clover code by airlied.
-
-#include <assert.h>
-#include <stdarg.h>
-#include <stddef.h>
-#include "u_printf.h"
-#include "util/macros.h"
-
-/* Some versions of MinGW are missing _vscprintf's declaration, although they
- * still provide the symbol in the import library. */
-#ifdef __MINGW32__
-_CRTIMP int _vscprintf(const char *format, va_list argptr);
-#endif
-
-#ifndef va_copy
-#ifdef __va_copy
-#define va_copy(dest, src) __va_copy((dest), (src))
-#else
-#define va_copy(dest, src) (dest) = (src)
-#endif
-#endif
-
-size_t
-u_printf_length(const char *fmt, va_list untouched_args)
-{
-   int size;
-   char junk;
-
-   /* Make a copy of the va_list so the original caller can still use it */
-   va_list args;
-   va_copy(args, untouched_args);
-
-#ifdef _WIN32
-   /* We need to use _vcsprintf to calculate the size as vsnprintf returns -1
-    * if the number of characters to write is greater than count.
-    */
-   size = _vscprintf(fmt, args);
-   (void)junk;
-#else
-   size = vsnprintf(&junk, 1, fmt, args);
-#endif
-   assert(size >= 0);
-
-   va_end(args);
-
-   return size;
-}