Tests: Update file(G_R_D) test to make system library optional

Since the system library may not exist on the filesystem on macOS
11, skip it if it doesn't exist.
32 jobs for !4998 with macos-11-file-GET_RUNTIME_DEPENDENCIES in 32 minutes and 14 seconds (queued for 1 second)
detached
Status Name Job ID Coverage
  Build
manual build:centos6-release #5072794
build docker linux manual
passed build:debian10-iwyu #5072791
build docker linux

00:12:55

manual build:fedora31-ninja #5072795
build docker linux linux-3.17 manual
passed build:fedora31-sphinx #5072793
build docker linux linux-3.17

00:18:10

passed build:fedora31-tidy #5072792
build docker linux linux-3.17

00:02:14

passed build:macos-makefiles #5072797
cmake macos shell xcode-11.5 nonconcurrent manual

00:07:04

manual build:macos-ninja #5072796
cmake macos shell xcode-11.5 nonconcurrent manual
manual build:windows-vs2019-x64-ninja #5072798
cmake windows shell vs2019 msvc-19.25 nonconcurrent manual
 
  Test
created test:fedora31-ninja #5072799
build docker linux linux-3.17
passed test:macos-makefiles #5072801
cmake macos shell xcode-11.5 nonconcurrent

00:21:31

created test:macos-ninja #5072800
cmake macos shell xcode-11.5 nonconcurrent
created test:windows-vs2019-x64-ninja #5072802
cmake windows shell vs2019 msvc-19.25 nonconcurrent
 
  Test Ext
created test:cuda10.2-nvidia #5072804
cuda-rt docker linux
created test:fedora31-makefiles #5072803
build docker linux linux-3.17
created test:fedora31-ninja-multi #5072805
build docker linux linux-3.17
created test:macos-xcode #5072806
cmake macos shell xcode-11.5 concurrent
created test:windows-vs2019-x64 #5072807
cmake windows shell vs2019 msvc-19.25 concurrent
 
  External
passed cdash

passed ghostflow-check-master

passed ghostflow-check-release

passed ghostflow-stager

passed cdash

passed cdash

passed cdash

passed ghostflow-stager

passed ghostflow-stager

passed ghostflow-stager

passed ghostflow-stager

passed ghostflow-stager

passed ghostflow-stager

passed ghostflow-stager

passed ghostflow-stager