fix buck build

Summary:
Was getting build errors

```
fbcode/python/errpy/vendor/tree-sitter-python/src/parser.c:8930:3: error: variable 'eof' set but not used [-Werror,-Wunused-but-set-variable]
  START_LEXER();
  ^
fbcode/python/errpy/vendor/tree-sitter-python/src/tree_sitter/parser.h:136:8: note: expanded from macro 'START_LEXER'
  bool eof = false;             \
       ^
1 error generated.
```

Reviewed By: stroxler

Differential Revision: D58826878

fbshipit-source-id: 6adb9d84afca5fa8f4de330f8f34b37f1fb82794

vendor/tree-sitter-python/src/parser.c

@@ -7987,7 +7987,7 @@ static inline bool sym_identifier_character_set_3(int32_t c) {
 
 static bool ts_lex(TSLexer *lexer, TSStateId state) {
   START_LEXER();
-  eof = lexer->eof(lexer);
+  bool eof = lexer->eof(lexer);
   switch (state) {
     case 0:
       if (eof) ADVANCE(41);
@@ -8928,7 +8928,7 @@ static bool ts_lex(TSLexer *lexer, TSStateId state) {
 
 static bool ts_lex_keywords(TSLexer *lexer, TSStateId state) {
   START_LEXER();
-  eof = lexer->eof(lexer);
+  bool eof = lexer->eof(lexer);
   switch (state) {
     case 0:
       if (lookahead == '\t' ||

vendor/tree-sitter-python/src/tree_sitter/parser.h

@@ -133,7 +133,6 @@ struct TSLanguage {
 #define START_LEXER()           \
   bool result = false;          \
   bool skip = false;            \
-  bool eof = false;             \
   int32_t lookahead;            \
   goto start;                   \
   next_state:                   \