Replace C shorts by integer types

lib/std/os/bits/linux.zig

@@ -1712,7 +1712,7 @@ pub const IFNAMESIZE = 16;
 pub const ifmap = extern struct {
     mem_start: c_ulong,
     mem_end: c_ulong,
-    base_addr: c_ushort,
+    base_addr: u16,
     irq: u8,
     dma: u8,
     port: u8,
@@ -1728,7 +1728,7 @@ pub const ifreq = extern struct {
         ifru_broadaddr: sockaddr,
         ifru_netmask: sockaddr,
         ifru_hwaddr: sockaddr,
-        ifru_flags: c_short,
+        ifru_flags: i16,
         ifru_ivalue: i32,
         ifru_mtu: i32,
         ifru_map: ifmap,