symboltable: Kill extraneous header

src/lfortran/semantics/ast_symboltable_visitor.cpp

@@ -1,9 +1,7 @@
-#include "lfortran/exception.h"
 #include <fstream>
 #include <iostream>
 #include <map>
 #include <memory>
-#include <stdint.h>
 #include <string>
 #include <cmath>
 #include <limits>
@@ -12,13 +10,13 @@
 #include <lfortran/asr.h>
 #include <lfortran/asr_utils.h>
 #include <lfortran/asr_verify.h>
+#include <lfortran/exception.h>
 #include <lfortran/semantics/asr_implicit_cast_rules.h>
 #include <lfortran/semantics/ast_common_visitor.h>
 #include <lfortran/semantics/ast_to_asr.h>
 #include <lfortran/parser/parser_stype.h>
 #include <lfortran/string_utils.h>
 #include <lfortran/utils.h>
-#include <sys/_types/_int64_t.h>
 
 namespace LFortran {