zunitc: Fix undeclared identifier 'NULL'
Since v6 release, -Dtest-junit-xml=false build regressed because its ifdef branch no longer includes stddef.h and thus NULL, either directly or through another header. Using musl-1.1.22 and llvm-8.0.0.
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Since v6 release, -Dtest-junit-xml=false build regressed because its ifdef branch no longer includes stddef.h and thus NULL, either directly or through another header. Using musl-1.1.22 and llvm-8.0.0.