Patch #553702: Cygwin make install patch

This patch fixes make install for Cygwin. Specifically,
it reverts to the previous behavior:

o install libpython$(VERSION)$(SO) in $(BINDIR)
o install $(LDLIBRARY) in $(LIBPL)

It also begins to remove Cygwin's dependency on
$(DLLLIBRARY) which I hope to take advantage of
when I attempt to make Cygwin as similar as possible
to the other Unix platforms (in other patches).

I tested this patch under Red Hat Linux 7.1 without
any ill effects.

BTW, I'm not the happiest using the following
test for Cygwin:

test "$(SO)" = .dll

I'm willing to update the patch to use:

case "$(MACHDEP)" in cygwin*

instead, but IMO that will look uglier.

Makefile.pre.in

@@ -559,11 +559,11 @@ altbininstall:	$(BUILDPYTHON)
 	done
 	$(INSTALL_PROGRAM) $(BUILDPYTHON) $(BINDIR)/python$(VERSION)$(EXE)
 	if test -f libpython$(VERSION)$(SO); then \
+		if test "$(SO)" = .dll; then \
+			$(INSTALL_SHARED) libpython$(VERSION)$(SO) $(BINDIR); \
+		else \
 			$(INSTALL_SHARED) libpython$(VERSION)$(SO) $(LIBDIR)/$(INSTSONAME); \
-	else	true; \
+		fi; \
-	fi
-	if test -f "$(DLLLIBRARY)"; then \
-		$(INSTALL_SHARED) $(DLLLIBRARY) $(BINDIR); \
 	else	true; \
 	fi
 
@@ -690,8 +690,12 @@ libainstall:	all
 	done
 	@if test -d $(LIBRARY); then :; else \
 		if test "$(PYTHONFRAMEWORKDIR)" = no-framework; then \
+			if test "$(SO)" = .dll; then \
+				$(INSTALL_DATA) $(LDLIBRARY) $(LIBPL) ; \
+			else \
 				$(INSTALL_DATA) $(LIBRARY) $(LIBPL)/$(LIBRARY) ; \
 				$(RANLIB) $(LIBPL)/$(LIBRARY) ; \
+			fi; \
 		else \
 			echo Skip install of $(LIBRARY) - use make frameworkinstall; \
 		fi; \