util/netif-mgmt: only include missing strlcpy header if actually missing

[Stefan-Schmidt]

In commit 4e2ef14 this header was
added unconditionally. For my system (Yocto with musl) this results in
strlcpy being redefined to __missing_strlcpy in all cases. No matter if
strlcpy is available or not.

Given it is available and the nl.m4 macros detects this, the libstrlcpy.la
helper is not build which results in:

netif-mgmt.c:386: more undefined references to `___missing_strlcpy' follow

Signed-off-by: Stefan Schmidt stefan.schmidt@huawei.com

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[Stefan-Schmidt]

@googlebot I signed it!

[Stefan-Schmidt]

Ping. First contribution here. CLA signed and Github checks are passing. Anything else I need to be aware of? Or just some patience. :-)