makefiles: Pass --subsystem to the linker also.

dlls/fltmgr.sys/Makefile.in

 MODULE    = fltmgr.sys
-EXTRADLLFLAGS = -Wb,--subsystem,native
+EXTRADLLFLAGS = -Wl,--subsystem,native
 
 C_SRCS = \
 	main.c

dlls/mountmgr.sys/Makefile.in

 MODULE    = mountmgr.sys
 IMPORTS   = uuid advapi32 ntoskrnl
 DELAYIMPORTS = user32
-EXTRADLLFLAGS = -Wb,--subsystem,native
+EXTRADLLFLAGS = -Wl,--subsystem,native
 EXTRAINCL = $(DBUS_CFLAGS) $(HAL_CFLAGS)
 EXTRALIBS = $(DISKARBITRATION_LIBS)
 

dlls/ndis.sys/Makefile.in

 MODULE    = ndis.sys
-EXTRADLLFLAGS = -Wb,--subsystem,native
+EXTRADLLFLAGS = -Wl,--subsystem,native
 
 C_SRCS = \
 	main.c

dlls/scsiport.sys/Makefile.in

 MODULE    = scsiport.sys
 IMPORTS   = ntoskrnl
-EXTRADLLFLAGS = -Wb,--subsystem,native
+EXTRADLLFLAGS = -Wl,--subsystem,native
 
 C_SRCS = \
 	scsiport.c

dlls/tdi.sys/Makefile.in

 MODULE    = tdi.sys
-EXTRADLLFLAGS = -Wb,--subsystem,native
+EXTRADLLFLAGS = -Wl,--subsystem,native
 
 C_SRCS = \
 	main.c

dlls/usbd.sys/Makefile.in

 MODULE    = usbd.sys
 IMPORTLIB = usbd
 IMPORTS   = ntoskrnl
-EXTRADLLFLAGS = -Wb,--subsystem,native
+EXTRADLLFLAGS = -Wl,--subsystem,native
 
 C_SRCS = \
 	usbd.c

dlls/winebus.sys/Makefile.in

@@ -2,7 +2,7 @@ MODULE    = winebus.sys
 IMPORTS   = ntoskrnl setupapi
 EXTRALIBS = $(IOKIT_LIBS) $(UDEV_LIBS)
 EXTRAINCL = $(UDEV_CFLAGS) $(SDL2_CFLAGS)
-EXTRADLLFLAGS = -Wb,--subsystem,native
+EXTRADLLFLAGS = -Wl,--subsystem,native
 
 C_SRCS = \
 	bus_iohid.c \

dlls/winehid.sys/Makefile.in

 MODULE    = winehid.sys
 IMPORTS   = hidclass ntoskrnl
-EXTRADLLFLAGS = -Wb,--subsystem,native
+EXTRADLLFLAGS = -Wl,--subsystem,native
 
 C_SRCS = \
 	main.c