The GE_49 check fails to detect gcc-10, but we dont care about old gcc
versions, so simply always apply the -Wno-date-time

Fixes: https://bugs.mageia.org/show_bug.cgi?id=26620

Signed-off-by: Thomas Backlund <tmb@mageia.org>

diff -Nurp broadcom-wl-6.30.223.271.orig/Makefile broadcom-wl-6.30.223.271/Makefile
--- broadcom-wl-6.30.223.271.orig/Makefile	2015-09-19 01:47:30.000000000 +0300
+++ broadcom-wl-6.30.223.271/Makefile	2020-05-15 16:28:08.586410105 +0300
@@ -141,9 +141,7 @@ EXTRA_CFLAGS       += -I$(src)/src/inclu
 EXTRA_CFLAGS       += -I$(src)/src/wl/sys -I$(src)/src/wl/phy -I$(src)/src/wl/ppr/include
 EXTRA_CFLAGS       += -I$(src)/src/shared/bcmwifi/include
 #EXTRA_CFLAGS       += -DBCMDBG_ASSERT -DBCMDBG_ERR
-ifeq "$(GE_49)" "1"
 EXTRA_CFLAGS       += -Wno-date-time
-endif
 
 EXTRA_LDFLAGS      := $(src)/lib/wlc_hybrid.o_shipped