use signed integers for tests

Author: pvdrz

tests/expectations/tests/remove_alias.rs

@@ -1,9 +1,9 @@
-// bindgen-flags: --remove-alias "uint.*"
+// bindgen-flags: --remove-alias "int.*"
 
-typedef unsigned long long uint64;
-typedef unsigned int uint32;
-typedef uint32 u32;
+typedef long long int64;
+typedef int int32;
+typedef int32 i32;
 
-uint64 foo();
-uint32 bar();
-u32 baz();
+int64 foo();
+int32 bar();
+i32 baz();