[PATCH ebtables] Fix musl libc compatibility

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Conflicting definitions of struct ethhdr between the kernel and musl
libc provides headers causes a build failure:

In file included from .../usr/include/netinet/ether.h:8:0,
                 from useful_functions.c:28:
.../usr/include/netinet/if_ether.h:107:8: error: redefinition of ‘struct ethhdr’
 struct ethhdr {
        ^~~~~~
In file included from include/linux/netfilter_bridge.h:8:0,
                 from include/linux/netfilter_bridge/ebtables.h:17,
                 from include/ebtables_u.h:27,
                 from useful_functions.c:25:
include/linux/if_ether.h:119:8: note: originally defined here
 struct ethhdr {
        ^~~~~~

Recent enough versions kernel headers allow the libc to suppress
conflicting kernel definitions. Include the libc proivded
netinet/ether.h before kernel headers to suppress the conflicting
definition of struct ethhdr.

Signed-off-by: Baruch Siach <baruch@xxxxxxxxxx>
---
 include/ebtables_u.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/ebtables_u.h b/include/ebtables_u.h
index c8589969bd8e..4824a145964e 100644
--- a/include/ebtables_u.h
+++ b/include/ebtables_u.h
@@ -24,6 +24,7 @@
 #ifndef EBTABLES_U_H
 #define EBTABLES_U_H
 #include <netinet/in.h>
+#include <netinet/ether.h>
 #include <linux/netfilter_bridge/ebtables.h>
 #include <linux/netfilter/x_tables.h>
 
-- 
2.17.0

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