Fix VS build problems:
* rename build -> buildfiles to avoid clashing with BUILD
* set binary mode for stdin/out in bro
* convert bro to C
diff --git a/BUILD b/BUILD
index 6dcc133..c475fdf 100644
--- a/BUILD
+++ b/BUILD
@@ -7,7 +7,7 @@
 
 licenses(["notice"])  # MIT
 
-STRICT_COMPILER_OPTIONS = [
+STRICT_C_OPTIONS = [
     "--pedantic-errors",
     "-Wall",
     "-Wconversion",
@@ -15,15 +15,12 @@
     "-Wextra",
     "-Wlong-long",
     "-Wmissing-declarations",
+    "-Wmissing-prototypes",
     "-Wno-strict-aliasing",
     "-Wshadow",
     "-Wsign-compare",
 ]
 
-STRICT_C_OPTIONS = STRICT_COMPILER_OPTIONS + [
-    "-Wmissing-prototypes",
-]
-
 COMMON_HEADERS = [
     "common/constants.h",
     "common/dictionary.h",
@@ -139,8 +136,8 @@
 
 cc_binary(
     name = "bro",
-    srcs = ["tools/bro.cc"],
-    copts = STRICT_COMPILER_OPTIONS,
+    srcs = ["tools/bro.c"],
+    copts = STRICT_C_OPTIONS,
     deps = [
         ":brotli_dec",
         ":brotli_enc",