SEACAS: nem_slice - add missing prototype for cygwin build

(From Sierra)

Build/Test Cases Summary
Enabled Packages: SEACASNemslice
Disabled Packages: Panzer,PyTrilinos,SEACASExo2mat,SEACASMat2exo
Enabled all Forward Packages
0) MPI_DEBUG => Skipped configure, build, test due to no enabled packages! => Does not affect push readiness! (-1.00 min)
1) SERIAL_RELEASE => Skipped configure, build, test due to no enabled packages! => Does not affect push readiness! (-1.00 min)
2) MPI_DEBUG_SS => passed: passed=3,notpassed=0 (1.44 min)
3) SERIAL_RELEASE_SS => passed: passed=5,notpassed=0 (1.24 min)
MueLu: fixing ba81ee0b82
MueLu: remove "disable Dirichlet detection"

missed this instance on my last checkin
MueLu: rebaselining for linAlgebra=Epetra

Build/Test Cases Summary
Enabled Packages: MueLu
Disabled Packages: MOOCHO
Enabled all Forward Packages
0) MPI_DEBUG => Skipped configure, build, test due to no enabled packages! => Does not affect push readiness! (-1.00 min)
1) SERIAL_RELEASE => Skipped configure, build, test due to no enabled packages! => Does not affect push readiness! (-1.00 min)
2) MPI_SS_DEBUG => FAILED: passed=111,notpassed=1 => Not ready to push! (3.12 min)
3) SERIAL_SS_DEBUG => FAILED: passed=95,notpassed=1 => Not ready to push! (2.30 min)
Other local commits for this build/test group: c5183c1
WARNING: Forced the push!