lib,wcc,w6a,w6l: char-literals for remaining source magic decimals (Wave-1)

selfhost/test/smoke.combined.ww

@@ -422,7 +422,7 @@ export fn mkdirs(path: str, mode: i32) (void | oserror) = {
 	// trigger an empty mkdir.
 	let i: i32 = 1;
 	for (i < n) {
-		if (pathbuf[i] == 47u8) {	// '/'
+		if (pathbuf[i] == '/') {
 			pathbuf[i] = 0u8;
 			let r: i32 = syscall2(nr.MKDIR,
 			    (&pathbuf[0]): i64, mode: i64): i32;
@@ -541,7 +541,7 @@ export fn getenv(name: str) (str | void) = {
 			j += 1;
 		};
 		if (matched) {
-			if (entry[name.len] == 61u8) {	// '='
+			if (entry[name.len] == '=') {
 				let val: *u8 = entry + ((name.len + 1): u64);
 				let n: i32 = 0;
 				for (val[n] != 0u8) { n += 1; };
@@ -6088,7 +6088,7 @@ let i64tos_buf: [65]u8 = [0...];	// 64 binary digits plus '-'
 export fn i64tos(i: i64, b: base) str = {
 	if (i >= 0) { return u64tos(i: u64, b); };
 
-	i64tos_buf[0] = 45u8;	// '-'
+	i64tos_buf[0] = '-';
 	// `(-i): u64`: for I64_MIN, -i wraps (two's complement) back to the
 	// I64_MIN bit pattern; reinterpreting to u64 yields the true
 	// magnitude 9223372036854775808. ref/hare/strconv/itos.ha:25. Probed