runuser: add 'drop' as an alias for runuser

The 'drop' alias for 'runuser' relaxes a number of constraints
that were introduced for compatibility:

- It works even if the current process doesn't have elevated
  privileges.

- It isn't necessary to specify the name of the user.

- Any command can be invoked, not just the BusyBox shell.

- If the command doesn't specify a path 'drop' will first look for
  a BusyBox applet then search PATH.

Adds 320-336 when built along with runuser.

(GitHub issue #240)

1 files changed, 1 insertions, 0 deletions

diff --git a/include/mingw.h b/include/mingw.h
index 7e6109f2e..0ccced2a3 100644
--- a/include/mingw.h
+++ b/include/mingw.h
@@ -593,3 +593,4 @@ char *get_last_slash(const char *path);
 const char *applet_to_exe(const char *name);
 char *get_user_name(void);
 char *quote_arg(const char *arg);
+char *find_first_executable(const char *name);