ci: fix some of `v test-cleancode` 2

vlib/builtin/utf8.v

@@ -21,7 +21,7 @@ pub fn utf32_to_str_no_malloc(code u32, buf voidptr) string {
 	icode := int(code) // Prevents doing casts everywhere
 	mut res := ''
 	unsafe {
-		mut buffer := byteptr(buf)
+		mut buffer := &byte(buf)
 		if icode <= 127 {
 			// 0x7F
 			buffer[0] = byte(icode)

vlib/dl/dl_windows.c.v

@@ -7,7 +7,7 @@ pub const (
 
 fn C.LoadLibrary(libfilename &u16) voidptr
 
-fn C.GetProcAddress(handle voidptr, procname byteptr) voidptr
+fn C.GetProcAddress(handle voidptr, procname &byte) voidptr
 
 fn C.FreeLibrary(handle voidptr) bool
 

vlib/gg/gg_android.c.v

@@ -19,10 +19,10 @@ pub:
 	callbacks        voidptr // Pointer to the callback function table of the native application. (struct ANativeActivityCallbacks *)
 	clazz            voidptr // The NativeActivity object handle.
 	env              voidptr // JNI context for the main thread of the app.
-	externalDataPath charptr // Path to this application's external (removable/mountable) data directory.
+	externalDataPath &char   // Path to this application's external (removable/mountable) data directory.
 	instance         voidptr // This is the native instance of the application.
-	internalDataPath charptr // Path to this application's internal data directory.
-	obbPath          charptr // Available starting with Honeycomb: path to the directory containing the application's OBB files (if any).
+	internalDataPath &char   // Path to this application's internal data directory.
+	obbPath          &char   // Available starting with Honeycomb: path to the directory containing the application's OBB files (if any).
 	sdkVersion       int     // The platform's SDK version code.
 	vm               voidptr // The global handle on the process's Java VM
 }

vlib/gg/image.v

@@ -119,7 +119,7 @@ fn create_image(file string) Image {
 	return img
 }
 
-pub fn (mut ctx Context) create_image_from_memory(buf byteptr, bufsize int) Image {
+pub fn (mut ctx Context) create_image_from_memory(buf &byte, bufsize int) Image {
 	stb_img := stbi.load_from_memory(buf, bufsize) or { return Image{} }
 	mut img := Image{
 		width: stb_img.width

vlib/math/big/big.v

@@ -19,9 +19,9 @@ fn C.bignum_from_int(n &Number, i u64)
 
 fn C.bignum_to_int(n &Number) int
 
-fn C.bignum_from_string(n &Number, s byteptr, nbytes int)
+fn C.bignum_from_string(n &Number, s &byte, nbytes int)
 
-fn C.bignum_to_string(n &Number, s byteptr, maxsize int)
+fn C.bignum_to_string(n &Number, s &byte, maxsize int)
 
 // c = a + b
 fn C.bignum_add(a &Number, b &Number, c &Number)