Link libssh into compat tests.

The cygwin compat code uses xmalloc, so add libssh.a so pick up that.

openbsd-compat/regress/Makefile.in

@@ -10,6 +10,7 @@ CFLAGS=@CFLAGS@
 CPPFLAGS=-I. -I.. -I../.. -I$(srcdir) -I$(srcdir)/.. -I$(srcdir)/../.. @CPPFLAGS@ @DEFS@
 EXEEXT=@EXEEXT@
 LIBCOMPAT=../libopenbsd-compat.a
+LIBSSH=../../libssh.a
 LIBS=@LIBS@ @CHANNELLIBS@
 LDFLAGS=@LDFLAGS@ $(LIBCOMPAT)
 
@@ -18,8 +19,8 @@ TESTPROGS=closefromtest$(EXEEXT) snprintftest$(EXEEXT) strduptest$(EXEEXT) \
 
 all:	t-exec ${OTHERTESTS}
 
-.c:	$(LIBCOMPAT)
-	$(CC) $(CFLAGS) $(CPPFLAGS) $(LDFLAGS) -o $@ $< $(LIBCOMPAT) $(LIBS)
+.c:	$(LIBCOMPAT) $(LIBSSH)
+	$(CC) $(CFLAGS) $(CPPFLAGS) $(LDFLAGS) -o $@ $< $(LIBCOMPAT) $(LIBSSH) $(LIBS)
 
 t-exec:	$(TESTPROGS)
 	@echo running compat regress tests