wext: Do not include typedefs for Android build

Android build gets __u32 and friends from
bionic/libc/kernel/arch-x86/asm/types.h and having the typedefs here
causes redefinition errors.

src/drivers/wireless_copy.h

@@ -84,11 +84,13 @@
 #else
 #include <sys/types.h>
 #include <net/if.h>
+#ifndef ANDROID
 typedef __uint32_t __u32;
 typedef __int32_t __s32;
 typedef __uint16_t __u16;
 typedef __int16_t __s16;
 typedef __uint8_t __u8;
+#endif /* ANDROID */
 #ifndef __user
 #define __user
 #endif /* __user */