broadcom-wl-dkms: restore -Wno-date-time patch

I was pretty sure it's no longer needed (dkms can be built in my set up)
but somehow it breaks in someone setup.

srcpkgs/broadcom-wl-dkms/patches/002-gcc-4.9.patch

@@ -0,0 +1,13 @@
+https://github.com/voidlinux/xbps-packages/issues/412
+
+--- a/Makefile	2014-05-21 12:47:46.915833131 +0200
++++ b/Makefile	2014-05-21 12:48:54.027409879 +0200
+@@ -126,6 +126,8 @@ EXTRA_CFLAGS       += -I$(src)/src/wl/sy
+ EXTRA_CFLAGS       += -I$(src)/src/shared/bcmwifi/include
+ #EXTRA_CFLAGS       += -DBCMDBG_ASSERT
+ 
++EXTRA_CFLAGS       += -Wno-date-time
++
+ EXTRA_LDFLAGS      := $(src)/lib/wlc_hybrid.o_shipped
+ 
+ KBASE              ?= /lib/modules/`uname -r`

srcpkgs/broadcom-wl-dkms/template

@@ -1,7 +1,7 @@
 # Template file for 'broadcom-wl-dkms'
 pkgname=broadcom-wl-dkms
 version=6.30.223.271
-revision=13
+revision=14
 archs="i686* x86_64*"
 create_wrksrc=yes
 depends="dkms"