compat-drivers: do not treat a warning as error

Older kernel version show more warnings like -Werror=unused-but-set-variable
and with this option they are treated as an error.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

patches/collateral-evolutions/network/68-do-not-add-Werror.patch

@@ -0,0 +1,8 @@
+--- a/drivers/net/wireless/ath/wil6210/Makefile
++++ b/drivers/net/wireless/ath/wil6210/Makefile
+@@ -9,5 +9,4 @@ wil6210-objs += wmi.o
+ wil6210-objs += interrupt.o
+ wil6210-objs += txrx.o
+
+-subdir-ccflags-y += -Werror
+ subdir-ccflags-y += -D__CHECK_ENDIAN__