join some common strings, -400 bytes

function                                             old     new   delta
print_intel_cstates                                  499     511     +12
file_insert                                          355     364      +9
dpkg_main                                           2944    2940      -4
ifenslave_main                                       645     640      -5
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 2/2 up/down: 21/-9)              Total: 12 bytes
   text	   data	    bss	    dec	    hex	filename
 937564	    932	  17676	 956172	  e970c	busybox_old
 937164	    932	  17676	 955772	  e957c	busybox_unstripped

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/runit/runsv.c b/runit/runsv.c
index d941e89..94d2860 100644
--- a/runit/runsv.c
+++ b/runit/runsv.c
@@ -114,7 +114,7 @@
 
 static void fatal2_cannot(const char *m1, const char *m2)
 {
-	bb_perror_msg_and_die("%s: fatal: cannot %s%s", dir, m1, m2);
+	bb_perror_msg_and_die("%s: fatal: can't %s%s", dir, m1, m2);
 	/* was exiting 111 */
 }
 static void fatal_cannot(const char *m)
@@ -124,7 +124,7 @@
 }
 static void fatal2x_cannot(const char *m1, const char *m2)
 {
-	bb_error_msg_and_die("%s: fatal: cannot %s%s", dir, m1, m2);
+	bb_error_msg_and_die("%s: fatal: can't %s%s", dir, m1, m2);
 	/* was exiting 111 */
 }
 static void warn_cannot(const char *m)