Merge branch 'maint'

* maint:
  portability: Disable support for long double in snprintf replacement
  portability: Handle system *sprintf functions with bad type signatures
  portability: Add Holger Weiß's improved snprintf replacement

diff --cc ccache.h
Simple merge

diff --cc configure.ac
index 551412611b43b979977f86821c6b0a1417317291,ffc49f8e1b1583d37e9d05e6eb5bc15abae4d78d..b97396b041289b0bca80932628ed1c4c4a02709d
--- 1/configure.ac
--- 2/configure.ac
+++ b/configure.ac
@@@ -45,12 -44,8 +44,9 @@@ AC_CHECK_FUNCS(getpwuid
  AC_CHECK_FUNCS(gettimeofday)
  AC_CHECK_FUNCS(mkstemp)
  AC_CHECK_FUNCS(realpath)
- AC_CHECK_FUNCS(snprintf)
  AC_CHECK_FUNCS(strndup)
 +AC_CHECK_FUNCS(strtok_r)
  AC_CHECK_FUNCS(utimes)
- AC_CHECK_FUNCS(vasprintf)
- AC_CHECK_FUNCS(vsnprintf)
  
  AC_CACHE_CHECK([for compar_fn_t in stdlib.h],ccache_cv_COMPAR_FN_T, [
      AC_TRY_COMPILE(