Fix compile error for DUK_OPT_NO_PC2LINE

The resulting code produces some function/variable unused warnings, but this
is OK for special options.

src/duk_bi_duktape.c

@@ -146,7 +146,11 @@ DUK_INTERNAL duk_ret_t duk_bi_duktape_object_act(duk_context *ctx) {
 	pc = (duk_uint_fast32_t) act->pc;
 	duk_push_uint(ctx, (duk_uint_t) pc);
 
+#if defined(DUK_USE_PC2LINE)
 	line = duk_hobject_pc2line_query(ctx, -2, pc);
+#else
+	line = 0;
+#endif
 	duk_push_uint(ctx, (duk_uint_t) line);
 
 	/* Providing access to e.g. act->lex_env would be dangerous: these

src/duk_js_compiler.c

@@ -1033,7 +1033,7 @@ DUK_LOCAL void duk__emit(duk_compiler_ctx *comp_ctx, duk_instr_t ins) {
 #endif
 
 	/* Limit checks for bytecode byte size and line number. */
-#if defined(DUK_USE_ESBC_LIMITS)
+#if defined(DUK_USE_PC2LINE) && defined(DUK_USE_ESBC_LIMITS)
 	if (DUK_UNLIKELY(line > DUK_USE_ESBC_MAX_LINENUMBER ||
 	                 DUK_HBUFFER_GET_SIZE((duk_hbuffer *) h) > DUK_USE_ESBC_MAX_BYTES)) {
 		DUK_ERROR(comp_ctx->thr, DUK_ERR_RANGE_ERROR, DUK_STR_BYTECODE_LIMIT);