Fix building QVMs on Linux with Windows line endings

On non-Windows, compiling QVM tools failed if dagcheck.md had CRLF line
endings and compiling QVMs failed if game source had CRLF line endings.

Also made Windows open the files as binary (no automatic CRLF to LF) so
it behaves the same as on non-Windows.

code/tools/lcc/cpp/lex.c

@@ -511,6 +511,25 @@ foldline(Source *s)
 	return 0;
 }
 
+// This doesn't have proper tracking across read() to only remove \r from \r\n sequence.
+// The lexer doesn't correctly handle standalone \r anyway though.
+int
+crlf_to_lf(unsigned char *buf, int n) {
+	int i, count;
+
+	count = 0;
+
+	for (i = 0; i < n; i++) {
+		if (buf[i] == '\r') {
+			continue;
+		}
+
+		buf[count++] = buf[i];
+	}
+
+	return count;
+}
+
 int
 fillbuf(Source *s)
 {
@@ -521,6 +540,7 @@ fillbuf(Source *s)
 		error(FATAL, "Input buffer overflow");
 	if (s->fd<0 || (n=read(s->fd, (char *)s->inl, INS/8)) <= 0)
 		n = 0;
+	n = crlf_to_lf(s->inl, n);
 	if ((*s->inp&0xff) == EOB) /* sentinel character appears in input */
 		*s->inp = EOFC;
 	s->inl += n;