dtc(1): Update to upstream ea3c233

Highlights of this update:
- /__local_fixups__ is now generated to be GPL dtc and libfdt compliant
- Compiling with -@ will now cause dtc to assign phandles to all labelled
  nodes
- /include/ and /incbin/ now handle absolute paths correctly
- The manpage now has information about overlays, including how to apply
  them and how to generate them
- Syntactic sugar for overlays is now supported, allowing an overlay DTS
  like:

=
/dts-v1/;
/plugin/;

&foo {
    foo,status = "okay";
};
=

to generate a fragment targetting <&foo>.

1 files changed, 0 insertions, 2 deletions

diff --git a/usr.bin/dtc/Makefile b/usr.bin/dtc/Makefile
index a834f622601f..5288637a98b5 100644
--- a/usr.bin/dtc/Makefile
+++ b/usr.bin/dtc/Makefile
@@ -4,8 +4,6 @@ PROG_CXX=dtc
 SRCS=	dtc.cc input_buffer.cc string.cc dtb.cc fdt.cc checking.cc
 MAN=	dtc.1
 
-WARNS?=	3
-
 CXXFLAGS+=	-std=c++11 -fno-rtti -fno-exceptions
 
 NO_SHARED?=NO