Simplify the checks for snprintf().

Do not check that the function is just available: first, it is in C99,
so the check almost certainly is a waste of time; second, the source
requires the function unconditionally; third, the subsequent "snprintf()
is suitable" check implies the "snprintf() is available" part anyway.

Author: infrastation

CMakeLists.txt

@@ -421,17 +421,6 @@ else(STDLIBS_HAVE_GETSERVENT)
 endif(STDLIBS_HAVE_GETSERVENT)
 cmake_pop_check_state()
 
-#
-# Make sure we have snprintf(); we require it.
-# We use check_symbol_exists(), as it isn't necessarily an external
-# function - in Visual Studio, for example, it is an inline function
-# calling an external function.
-#
-check_symbol_exists(snprintf "stdio.h" HAVE_SNPRINTF)
-if(NOT HAVE_SNPRINTF)
-    message(FATAL_ERROR "snprintf() is required but wasn't found")
-endif()
-
 #
 # Require a proof of suitable snprintf(3), same as in Autoconf.
 #

configure.ac

@@ -283,12 +283,6 @@ AC_LBL_LIBRARY_NET
 AC_REPLACE_FUNCS(strlcat strlcpy strsep getservent getopt_long)
 AC_CHECK_FUNCS(fork vfork)
 
-#
-# Make sure we have snprintf(); we require it.
-#
-AC_CHECK_FUNC(snprintf,,
-    AC_MSG_ERROR([snprintf() is required but wasn't found]))
-
 #
 # It became apparent at some point that using a suitable C99 compiler does not
 # automatically mean snprintf(3) implementation in the libc supports all the