fix: module syntax — changed src_bux/*.bux from module X; to module X { ... }

src_bux/parser.bux

@@ -1,6 +1,6 @@
 // parser.bux — Recursive descent parser (ported from parser.nim)
 // Parses Bux source tokens into an AST.
-module Parser;
+module Parser {
 
 extern func bux_strlen(s: String) -> uint;
 
@@ -1002,4 +1002,4 @@ func Parser_DiagCount(p: *Parser) -> int {
 func Parser_Free(p: *Parser) {
     bux_free(p.diags as *void);
     bux_free(p as *void);
-}
+}