Avoid tainting srcdir for win32 builds.

modules/libreg/standalone/Makefile.in

@@ -50,6 +50,8 @@ ifeq ($(OS_ARCH),WINNT)
 GARBAGE		+= $(addprefix $(srcdir)/,$(MODULES_LIBREG_SRC_LCSRCS))
 endif
 
+SRCS_IN_OBJDIR = 1
+
 include $(topsrcdir)/config/rules.mk
 
 DEFINES += -DSTANDALONE_REGISTRY
@@ -57,9 +59,5 @@ DEFINES += -DSTANDALONE_REGISTRY
 LOCAL_INCLUDES = -I$(srcdir)/../src
 
 export:: $(MODULES_LIBREG_SRC_CSRCS)
-ifeq ($(OS_ARCH),WINNT)
-	$(INSTALL) $^ $(srcdir)
-else
 	$(INSTALL) $^ .
-endif