compiler: allow function expecting a void* to receive a byteptr

vlib/builtin/isnil_test.v

@@ -0,0 +1,19 @@
+fn test_isnil_byteptr(){
+	pb := byteptr(0)
+	assert isnil( pb )
+}
+
+fn test_isnil_voidptr(){
+	pv := voidptr(0)
+	assert isnil( pv )
+}
+
+fn test_isnil_charptr(){
+	pc := &char(0)
+	assert isnil( pc )
+}
+
+fn test_isnil_intptr(){
+	pi := &int(0)
+	assert isnil( pi )
+}

vlib/compiler/fn.v

@@ -1161,6 +1161,7 @@ fn (p mut Parser) fn_call_args(f mut Fn) {
 				}
 				// println('\ne:"$expected" got:"$got"')
 				else if ! (expected == 'void*' && got == 'int') &&
+				! (expected == 'void*' && got == 'byteptr') &&
 				! (expected == 'byte*' && got.contains(']byte')) &&
 				! (expected == 'byte*' && got == 'string') &&
 				//! (expected == 'void*' && got == 'array_int') {