checker: cleanup type alias pascal case check (#10217)

vlib/time/time.v

@@ -5,8 +5,6 @@ module time
 
 #include <time.h>
 
-type time_t = i64
-
 pub const (
 	days_string        = 'MonTueWedThuFriSatSun'
 	month_days         = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]

vlib/time/time_nix.c.v

@@ -18,7 +18,7 @@ struct C.tm {
 	tm_isdst int
 }
 
-fn C.timegm(&C.tm) time_t
+fn C.timegm(&C.tm) C.time_t
 
 // fn C.gmtime_r(&tm, &gbuf)
 fn C.localtime_r(t &time_t, tm &C.tm)

vlib/v/checker/checker.v

@@ -311,8 +311,8 @@ pub fn (mut c Checker) type_decl(node ast.TypeDecl) {
 }
 
 pub fn (mut c Checker) alias_type_decl(node ast.AliasTypeDecl) {
-	// TODO Replace `c.file.mod.name != 'time'` by `it.language != .v` once available
-	if c.file.mod.name !in ['time', 'builtin'] {
+	// TODO Remove when `u8` isn't an alias in builtin anymore
+	if c.file.mod.name != 'builtin' {
 		c.check_valid_pascal_case(node.name, 'type alias', node.pos)
 	}
 	c.ensure_type_exists(node.parent_type, node.type_pos) or { return }