FreeBSD: fix up the package name

When using libpkg, the output filename is determined by libpkg
itself, based on information in the manifest: package name and
version, basically. This doesn't necessarily match the name that
CMake has determined via CPACK_TEMPORARY_PACKAGE_FILE_NAME or
CPACK_PACKAGE_FILE_NAME. So reset the CMake-determined list
to match what libpkg will do.
31 jobs for !5854 with issue-18031 in 17 minutes and 20 seconds (queued for 2 seconds)
latest detached
Status Job ID Name Coverage
  Build
passed #5570844
linux docker cmake build manual
build:centos6-x86_64

00:06:09

passed #5570841
linux docker cmake build
build:debian10-iwyu

00:02:38

passed #5570845
linux docker cmake build linux-3.17 manual
build:fedora33-ninja

00:02:08

passed #5570843
linux docker cmake build linux-3.17
build:fedora33-sphinx

00:04:12

passed #5570842
linux docker cmake build linux-3.17
build:fedora33-tidy

00:04:56

manual #5570847
cmake macos shell nonconcurrent xcode-12.3 manual
build:macos-x86_64-makefiles
manual #5570846
cmake macos shell nonconcurrent xcode-12.3 manual
build:macos-x86_64-ninja
manual #5570848
windows cmake shell vs2019 nonconcurrent msvc-19.28 manual
build:windows-vs2019-x64-ninja
 
  Test
passed #5570849
linux docker cmake x11 linux-3.17
test:fedora33-ninja

00:04:42

created #5570851
cmake macos shell nonconcurrent xcode-12.3
test:macos-x86_64-makefiles
created #5570850
cmake macos shell nonconcurrent xcode-12.3
test:macos-x86_64-ninja
created #5570852
windows cmake shell vs2019 nonconcurrent msvc-19.28
test:windows-vs2019-x64-ninja
 
  Test Ext
passed #5570855
linux docker cmake cuda-rt
test:cuda10.2-nvidia

00:01:55

passed #5570853
linux docker cmake build linux-3.17
test:debian10-ninja

00:03:01

passed #5570854
linux docker cmake build linux-3.17
test:fedora33-makefiles

00:04:08

passed #5570856
linux docker cmake build linux-3.17
test:fedora33-ninja-multi

00:05:30

created #5570857
cmake macos shell concurrent xcode-12.3
test:macos-x86_64-xcode
created #5570858
windows cmake shell vs2019 concurrent msvc-19.28
test:windows-vs2019-x64
 
  External
passed cdash

passed ghostflow-check-master

passed ghostflow-stager

passed cdash

passed cdash

passed cdash

passed cdash

passed cdash

passed cdash

passed ghostflow-stager

passed ghostflow-stager

passed ghostflow-stager

passed ghostflow-stager