Move noexec path into sudo.conf now that sudo itself handles noexec.

Currently can be configured in sudoers too but is now undocumented
and will be removed in a future release.

src/sudo.h

@@ -139,7 +139,6 @@ struct command_details {
     const char *chroot;
     const char *selinux_role;
     const char *selinux_type;
-    const char *noexec_file;
     char **argv;
     char **envp;
 };
@@ -163,6 +162,7 @@ void cleanup(int);
 char *tgetpass(const char *, int, int);
 int tty_present(void);
 extern const char *askpass_path;
+extern const char *noexec_path;
 
 /* zero_bytes.c */
 void zero_bytes(volatile void *, size_t);