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[build] Use GNUInstallDirs for NGS_PATH - fix #859

Job	Run time
Build in gcc-default (archlinux:base)	1m 17s
Build in gcc-14 (ubuntu-24.04)	29s
Build in clang-default (archlinux:base)	1m 11s
Build in clang-18 (ubuntu-24.04)	28s
Build in clang-9 (debian:11.1)	56s
Build in gcc-9 (debian:11.1)	52s
Build in clang-11 (debian:11.1)	1m 1s
Build in clang-default (fedora:34)	1m 24s
Build in gcc-10 (debian:11.1)	48s
Build in gcc-default (fedora:34)	1m 23s
Build in gcc-default (fedora:35)	1m 27s
Build in clang-default (fedora:35)	1m 25s
Build with gcc-10 (macOS-12)	54s
Build with default Xcode (macOS-12)	43s
Build in (bookworm - aarch64)	4m 11s
Build with gcc-11 (macOS-12)	43s
Build in (bookworm - s390x)	4m 44s
Build in (bookworm - ppc64le)	4m 26s
	28m 22s

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