hostapd: fix compilation error in wext backend

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

package/network/services/hostapd/patches/432-missing-typedef.patch

@@ -0,0 +1,10 @@
+--- a/src/drivers/linux_wext.h
++++ b/src/drivers/linux_wext.h
+@@ -26,6 +26,7 @@ typedef int32_t __s32;
+ typedef uint16_t __u16;
+ typedef int16_t __s16;
+ typedef uint8_t __u8;
++typedef int8_t __s8;
+ #ifndef __user
+ #define __user
+ #endif /* __user */