Added prototype of yylex() function #25

Required for building with the new gcc-14

When building a new compiler, it gives an error:

parser.c:2001:16: error: implicit declaration of function ‘yylex’ [-Wimplicit-function-declaration]
 2001 |       yychar = yylex ();

On earlier versions of compilers, it should produce a warning.
This fix resolves this issue.

Required for building with the new gcc-14 When building a new compiler, it gives an error: ``` parser.c:2001:16: error: implicit declaration of function ‘yylex’ [-Wimplicit-function-declaration] 2001 | yychar = yylex (); ``` On earlier versions of compilers, it should produce a warning. This fix resolves this issue.

Minor adjustment required

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Added prototype of yylex() function #25

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 @ -31,3 +31,3 @@
 #define inMainModule()      (currentSpec->module == currentModule || currentModule->container != NULL)
 int yylex();