[int.h] Adding typedef for i8, u8, i16 and u16

src/int.h

@@ -3,6 +3,10 @@
 
 #include <stdint.h>
 
+typedef int8_t i8;
+typedef uint8_t u8;
+typedef int16_t i16;
+typedef uint16_t u16;
 typedef int32_t i32;
 typedef uint32_t u32;
 typedef int64_t i64;