Revert "Add c++ support"

This reverts commit 5762271fd0.

def.yy

@@ -1,17 +1,14 @@
 %{
-#include <cstring>
-#include <cstdio>
-#include <cstdlib>
-#include <FlexLexer.h>
-
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
 #define INFILE_ERROR 1
 #define OUTFILE_ERROR 2
 
-extern yyFlexLexer lexer;
-
-void yyerror(const char *s);
-int yylex();
-
+extern int yylex(void);
+extern void yyerror(const char *s);
+extern int yylineno;
+extern FILE *yyin;
 %}
 
 %union {
@@ -48,7 +45,7 @@ statement
 
 variable_declaration
     : LET ID COLON INT_TYPE '=' expression SEMICOLON
-        { printf("Deklaracja zmiennej: %s\n", $2); free($2); }
+        { printf("Deklaracja zmiennej: %s\n", $2); }
     ;
 
 expression
@@ -58,21 +55,11 @@ expression
     | expression '/' expression { printf("Wyrazenie z /\n"); }
     | '(' expression ')' { printf("Wyrazenie w nawiasach\n"); }
     | INT_LIT { printf("Literal calkowity: %d\n", $1); }
-    | ID { printf("Identyfikator: %s\n", $1); free($1); }
+    | ID { printf("Identyfikator: %s\n", $1); }
     ;
 
 %%
 
-yyFlexLexer lexer;
-
-int yylex() {
-    return lexer.yylex();
-}
-
-void yyerror(const char *s) {
-    fprintf(stderr, "Blad: %s w linii %d\n", s, lexer.lineno());
-}
-
 int main(int argc, char *argv[]) {
     yyparse();
     return 0;