fix musl compatibility

Let configure include sys/if_tun.h when testing for netinet/if_ether.h
to detect the Kernel/libc header conflict on musl.

After this patch, configure will correctly detect netinet/if_ether.h as
unusable and the subsequent compilation will not attempt to use it.

Conflicts:
	src/have.h

diff --git a/src/have.h b/src/have.h
index 9dc3b04..88733a1 100644 (file)
--- a/src/have.h
+++ b/src/have.h
@@ -206,6 +206,10 @@
 #include <resolv.h>
 #endif
 
+#ifdef HAVE_LINUX_IF_TUN_H
+#include <linux/if_tun.h>
+#endif
+
 #ifdef STATUS
 #undef STATUS
 #endif