Remove HSUNIX_EXECVPE_H_NO_COMPAT hack

Now we can finally remove the hack introduced via

59861061
256b1918
7bad9d7d

Co-authored-by: Herbert Valerio Riedel <hvr@gnu.org>

cbits/execvpe.c

@@ -22,7 +22,6 @@
 #include <string.h>
 #include <errno.h>
 
-#define HSUNIX_EXECVPE_H_NO_COMPAT
 #include "execvpe.h"
 
 #if !defined(execvpe) && !HAVE_DECL_EXECVPE

changelog.md

@@ -15,6 +15,8 @@
     which now must be passed as part of `OpenFileFlags`
     (e.g. `defaultFileFlags { creat = Just mode }`)  (#58)
 
+  * Remove deprecated `execvpe(3)` legacy-emulation CPP macro
+
 ## 2.7.2.2  *May 2017*
 
   * Bundled with GHC 8.2.1

include/execvpe.h

@@ -10,16 +10,4 @@
 extern int
 __hsunix_execvpe(const char *name, char *const argv[], char *const envp[]);
 
-// this hack is needed for `process`; to be removed in unix-2.8
-#ifndef HSUNIX_EXECVPE_H_NO_COMPAT
-#include "HsUnixConfig.h"
-#if HAVE_EXECVPE
-# include <unistd.h>
-extern int
-execvpe(const char *name, char *const argv[], char *const envp[]);
-#else
-# define execvpe(name,argv,envp) __hsunix_execvpe(name,argv,envp)
-#endif
-#endif
-
 #endif