Free ICD "library_path" when it contains an empty string #830

Job	Run time
codegen	13s
linux-32-no-asm	47s
chromium	1m 19s
linux-32 (Debug)	42s
linux (gcc, g++, Debug, ubuntu-20.04)	32s
linux-32 (Release)	43s
linux-no-asm	3m 31s
linux (gcc, g++, Debug, ubuntu-22.04)	26s
linux (gcc, g++, Release, ubuntu-20.04)	36s
linux (gcc, g++, Release, ubuntu-22.04)	31s
linux (clang, clang++, Debug, ubuntu-20.04)	35s
linux (clang, clang++, Debug, ubuntu-22.04)	42s
linux (clang, clang++, Release, ubuntu-20.04)	30s
linux (clang, clang++, Release, ubuntu-22.04)	30s
windows_clang (clang, Debug)	1m 28s
windows_clang (clang, Release)	1m 30s
mingw-no-asm	1m 7s
mingw-no-asm-explicit	1m 3s
mingw	1m 18s
windows_clang (clang-cl, Debug)	1m 31s
windows_clang (clang-cl, Release)	1m 30s
mingw-use-gas	1m 5s
windows_vs (Win32, Debug)	2m 25s
windows_vs-no-asm (Win32)	2m 22s
windows_vs (Win32, Release)	2m 23s
windows_vs-no-asm (x64)	2m 21s
windows_vs (x64, Debug)	2m 21s
windows_vs (x64, Release)	2m 24s
mac	0s
Universal Binary Testing (STATIC ${{ matrix.static }}) w/ ${{ matrix.generator }}	0s
${{ matrix.CMAKE_SYSTEM_NAME }}	0s
	36m 25s

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