Don't try and strip ssmtp during install as this tries to run the native
strip rather than strip for the target platform.

--- ssmtp-2.61/Makefile.in	2006/07/04 04:43:06	1.1
+++ ssmtp-2.61/Makefile.in	2006/07/04 04:43:17
@@ -48,7 +48,7 @@
 .PHONY: install
 install: ssmtp $(GEN_CONFIG)
 	$(INSTALL) -d -m 755 $(bindir)
-	$(INSTALL) -s -m 755 ssmtp $(bindir)/ssmtp
+	$(INSTALL) -m 755 ssmtp $(bindir)/ssmtp
 	$(INSTALL) -d -m 755 $(mandir)
 	$(INSTALL) -m 644 $(srcdir)/ssmtp.8 $(mandir)/ssmtp.8
 	$(INSTALL) -d -m 755 $(SSMTPCONFDIR)