[strace/strace] Error building against musl libc - error: "__UAPI_DEF_IN6_ADDR_ALT" redefined (#177)

[Chris Packham]

Hi,

I'm trying to update crosstool-ng to include a newer strace version (current version supported is 5.8).

When building against musl libc I strike this error

```
[ALL  ]    In file included from /home/x-tool/.build/arm-unknown-linux-musleabi/src/strace/bundled/linux/include/uapi/linux/in6.h:26,
[ALL  ]                     from /home/x-tool/.build/arm-unknown-linux-musleabi/src/strace/bundled/linux/include/uapi/linux/if_bridge.h:19,
[ALL  ]                     from /home/x-tool/.build/arm-unknown-linux-musleabi/src/strace/src/rtnl_mdb.c:16:
[ERROR]    /home/x-tool/.build/arm-unknown-linux-musleabi/src/strace/bundled/linux/include/uapi/linux/libc-compat.h:109: error: "__UAPI_DEF_IN6_ADDR_ALT" redefined [-Werror]
[ALL  ]      109 | #define __UAPI_DEF_IN6_ADDR_ALT  1
[ALL  ]          |
[ALL  ]    In file included from /home/x-tool/.build/arm-unknown-linux-musleabi/src/strace/src/rtnl_mdb.c:15:
[ALL  ]    /home/x-tool/x-tools/arm-unknown-linux-musleabi/arm-unknown-linux-musleabi/sysroot/usr/include/netinet/in.h:401: note: this is the location of the previous definition
[ALL  ]      401 | #define __UAPI_DEF_IN6_ADDR_ALT 0
[ALL  ]          |
[ALL  ]    cc1: all warnings being treated as errors
[ERROR]    make[4]: *** [Makefile:6660: libstrace_a-rtnl_mdb.o] Error 1
[ALL  ]    make[4]: Leaving directory '/home/x-tool/.build/arm-unknown-linux-musleabi/build/build-strace/src'
[ERROR]    make[3]: *** [Makefile:2404: all] Error 2
[ALL  ]    rm ioctlsort0.o ioctls_all0.h ioctlsort0
[ALL  ]    make[3]: Leaving directory '/home/x-tool/.build/arm-unknown-linux-musleabi/build/build-strace/src'
[ERROR]    make[2]: *** [Makefile:601: all-recursive] Error 1
[ALL  ]    make[2]: Leaving directory '/home/x-tool/.build/arm-unknown-linux-musleabi/build/build-strace'
[ERROR]    make[1]: *** [Makefile:506: all] Error 2
[ALL  ]    make[1]: Leaving directory '/home/x-tool/.build/arm-unknown-linux-musleabi/build/build-strace'
```

any suggestions?

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