exec_cmd: remove unused extern

This definition was added by commit 77cb17e, but it's left unused since
commit 511707d. Remove the left-over definition.

Signed-off-by: Erik Faye-Lund <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: kusma

exec_cmd.c

@@ -3,7 +3,6 @@
 #include "quote.h"
 #define MAX_ARGS	32
 
-extern char **environ;
 static const char *argv_exec_path;
 static const char *argv0_path;