cleanup(selfhost): remove 24 DEBUG prints + stale parser HACK

- Remove DEBUG prints from c_backend.bux, hir_lower.bux, lexer.bux, parser.bux
- Remove HACK for stray } in parserParseFuncDecl (no longer needed after
  Decl refactor in 4a86009)
- Clean selfhost check/build output

src/parser.bux

@@ -1172,11 +1172,6 @@ func parserParseFuncDecl(p: *Parser, isPublic: bool, isExtern: bool, isAsync: bo
     // Body
     if !isExtern && parserCheck(p, tkLBrace) {
         d.refBody = parserParseBlock(p);
-        // HACK: if parserParseBlock left a stray } at current position,
-        // consume it. Without this, the module handler exits early.
-        if parserCheck(p, tkRBrace) {
-            discard parserAdvance(p);
-        }
     } else {
         d.refBody = null as *Block;
     }
@@ -1242,7 +1237,6 @@ func parserParseStructDecl(p: *Parser, isPublic: bool) -> *Decl {
         fieldCount = fieldCount + 1;
     }
     d.fieldCount = fieldCount;
-    PrintLine(String_Concat("DEBUG parser endStruct fieldCount=", bux_int_to_str(fieldCount as int64)));
     discard parserExpect(p, tkRBrace, "expected '}'");
     return d;
 }