12264 halt: unused label

Review Request #2505 - Created Jan. 29, 2020 and updated

Information
Marcel Telka
illumos-gate
master
12264
5268975...
Reviewers
general
This removes an unused label from halt.c together with -_gcc=-Wno-unused-label
removal from the Makefile.
Nightly passed even without -Wno-unused-label for halt.
Matthias Scheler
Ship It!
Toomas Soome
Ship It!
Peter Tribble
Ship It!
Gergő Mihály Doma
Ship It!
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