Bugzilla bug 240784: checked in a temporary workaround for the fix for

bug 240784 that breaks OS/2 tinderbox.  The problem seems to be that OS/2
file system is case insensitive, so nsinstall won't change the file name
of an existing DLL in mozilla/dist/$(OBJDIR)/lib, but gmake is case
sensitive, and gmake can't find a rule to build softokn3.chk from because
the softokn3 DLL in mozilla/dist/$(OBJDIR)/lib doesn't have the right name.

security/coreconf/rules.mk

@@ -113,6 +113,9 @@ ifdef LIBRARY
 	$(INSTALL) -m 664 $(LIBRARY) $(SOURCE_LIB_DIR)
 endif
 ifdef SHARED_LIBRARY
+ifeq ($(OS_TARGET),OS2)
+	rm -f $(SOURCE_LIB_DIR)/$(notdir $(SHARED_LIBRARY))
+endif
 	$(INSTALL) -m 775 $(SHARED_LIBRARY) $(SOURCE_LIB_DIR)
 endif
 ifdef IMPORT_LIBRARY