Update posix.cfg [skip ci]

Author: chrchr-github

cfg/posix.cfg

@@ -4204,7 +4204,6 @@ The function 'mktemp' is considered to be dangerous due to race conditions and s
       <not-null/>
       <not-uninit/>
       <strz/>
-      <minsize type="argvalue" arg="3"/>
     </arg>
     <arg nr="3" direction="in">
       <not-uninit/>