libxtables: Unexport init_extensions*() declarations

The functions are used for static builds to initialize extensions after
libxtables init. Regular library users should not need them, but the
empty declarations introduced in #else case (and therefore present in
user's env) may clash with existing symbol names.

Avoid problems and guard the whole block declaring the function
prototypes and mangling extensions' _init functions by XTABLES_INTERNAL.

Reported-by: Nick Hainke <vincent@systemli.org>
Fixes: 6c689b639cf8e ("Simplify static build extension loading")
Signed-off-by: Phil Sutter <phil@nwl.cc>

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