V4L/DVB (5745): Dvb: use '+=' instead of '=' for EXTRA_CFLAGS

The Makefiles in the dvb directory tree used '=' when defining EXTRA_CFLAGS
rather than '+=', which is far more common in the rest of the kernel source.
  =  14 times (9 of which this patch removes)
 :=  25 times
 += 123 times
This change also has certain advantages for the out of kernel v4l-dvb build
system.
Signed-off-by: Trent Piepho <xyzzy@speakeasy.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/dvb/b2c2/Makefile

@@ -12,4 +12,4 @@ obj-$(CONFIG_DVB_B2C2_FLEXCOP_PCI) += b2c2-flexcop-pci.o
 b2c2-flexcop-usb-objs = flexcop-usb.o
 obj-$(CONFIG_DVB_B2C2_FLEXCOP_USB) += b2c2-flexcop-usb.o
 
-EXTRA_CFLAGS = -Idrivers/media/dvb/dvb-core/ -Idrivers/media/dvb/frontends/
+EXTRA_CFLAGS += -Idrivers/media/dvb/dvb-core/ -Idrivers/media/dvb/frontends/

drivers/media/dvb/bt8xx/Makefile

 obj-$(CONFIG_DVB_BT8XX) += bt878.o dvb-bt8xx.o dst.o dst_ca.o
 
-EXTRA_CFLAGS = -Idrivers/media/dvb/dvb-core/ -Idrivers/media/video/bt8xx -Idrivers/media/dvb/frontends
+EXTRA_CFLAGS += -Idrivers/media/dvb/dvb-core/ -Idrivers/media/video/bt8xx -Idrivers/media/dvb/frontends

drivers/media/dvb/cinergyT2/Makefile

 obj-$(CONFIG_DVB_CINERGYT2) += cinergyT2.o
 
-EXTRA_CFLAGS = -Idrivers/media/dvb/dvb-core/
+EXTRA_CFLAGS += -Idrivers/media/dvb/dvb-core/

drivers/media/dvb/dvb-usb/Makefile

@@ -61,4 +61,4 @@ obj-$(CONFIG_DVB_USB_AF9005) += dvb-usb-af9005.o
 dvb-usb-af9005-remote-objs = af9005-remote.o
 obj-$(CONFIG_DVB_USB_AF9005_REMOTE) += dvb-usb-af9005-remote.o
 
-EXTRA_CFLAGS = -Idrivers/media/dvb/dvb-core/ -Idrivers/media/dvb/frontends/
+EXTRA_CFLAGS += -Idrivers/media/dvb/dvb-core/ -Idrivers/media/dvb/frontends/

drivers/media/dvb/frontends/Makefile

@@ -2,7 +2,7 @@
 # Makefile for the kernel DVB frontend device drivers.
 #
 
-EXTRA_CFLAGS = -Idrivers/media/dvb/dvb-core/
+EXTRA_CFLAGS += -Idrivers/media/dvb/dvb-core/
 
 obj-$(CONFIG_DVB_PLL) += dvb-pll.o
 obj-$(CONFIG_DVB_STV0299) += stv0299.o

drivers/media/dvb/pluto2/Makefile

 obj-$(CONFIG_DVB_PLUTO2) += pluto2.o
 
-EXTRA_CFLAGS = -Idrivers/media/dvb/dvb-core/ -Idrivers/media/dvb/frontends/
+EXTRA_CFLAGS += -Idrivers/media/dvb/dvb-core/ -Idrivers/media/dvb/frontends/

drivers/media/dvb/ttpci/Makefile

@@ -11,7 +11,7 @@ obj-$(CONFIG_DVB_BUDGET_CI) += budget-core.o budget-ci.o ttpci-eeprom.o
 obj-$(CONFIG_DVB_BUDGET_PATCH) += budget-core.o budget-patch.o ttpci-eeprom.o
 obj-$(CONFIG_DVB_AV7110) += dvb-ttpci.o ttpci-eeprom.o
 
-EXTRA_CFLAGS = -Idrivers/media/dvb/dvb-core/ -Idrivers/media/dvb/frontends/
+EXTRA_CFLAGS += -Idrivers/media/dvb/dvb-core/ -Idrivers/media/dvb/frontends/
 
 hostprogs-y	:= fdump
 

drivers/media/dvb/ttusb-budget/Makefile

 obj-$(CONFIG_DVB_TTUSB_BUDGET) += dvb-ttusb-budget.o
 
-EXTRA_CFLAGS = -Idrivers/media/dvb/dvb-core/ -Idrivers/media/dvb/frontends
+EXTRA_CFLAGS += -Idrivers/media/dvb/dvb-core/ -Idrivers/media/dvb/frontends

drivers/media/dvb/ttusb-dec/Makefile

 obj-$(CONFIG_DVB_TTUSB_DEC) += ttusb_dec.o ttusbdecfe.o
 
-EXTRA_CFLAGS = -Idrivers/media/dvb/dvb-core/
+EXTRA_CFLAGS += -Idrivers/media/dvb/dvb-core/