Cleanup of unused and superfluous code in `src/vkutil.*` #122

Job	Run time
Run static checkers	41s
Installation tests	5s
macOS	15s
Windows	2m 16s
Release-build [gcc-13, cmake-3.29 sanitizer=""]	2m 52s
Release-build [gcc-13, cmake-3.29 sanitizer="thread"]	2m 52s
Windows (MinGW64)	51s
Release-build [gcc-13, cmake-3.29 sanitizer="undefined"]	2m 51s
Release-build [gcc-13, cmake-3.29 sanitizer="leak"]	7m 24s
Release-build [gcc-13, cmake-3.29 sanitizer="address"]	2m 48s
RelWithDebInfo-build [gcc-13, cmake-3.29 sanitizer=""]	3m 2s
RelWithDebInfo-build [gcc-13, cmake-3.29 sanitizer="thread"]	2m 47s
RelWithDebInfo-build [gcc-13, cmake-3.29 sanitizer="undefined"]	2m 42s
RelWithDebInfo-build [gcc-13, cmake-3.29 sanitizer="leak"]	2m 57s
RelWithDebInfo-build [gcc-13, cmake-3.29 sanitizer="address"]	3m 1s
Release-build [clang-18, cmake-3.29 sanitizer=""]	3m 35s
Release-build [clang-18, cmake-3.29 sanitizer="thread"]	3m 11s
Release-build [clang-18, cmake-3.29 sanitizer="undefined"]	3m 8s
Release-build [clang-18, cmake-3.29 sanitizer="leak"]	3m 4s
Release-build [clang-18, cmake-3.29 sanitizer="address"]	3m 17s
RelWithDebInfo-build [clang-18, cmake-3.29 sanitizer=""]	3m 6s
RelWithDebInfo-build [clang-18, cmake-3.29 sanitizer="thread"]	3m 24s
RelWithDebInfo-build [clang-18, cmake-3.29 sanitizer="undefined"]	3m 19s
RelWithDebInfo-build [clang-18, cmake-3.29 sanitizer="leak"]	3m 20s
RelWithDebInfo-build [clang-18, cmake-3.29 sanitizer="address"]	3m 11s
Release-build [gcc-7, cmake-3.11 sanitizer=""]	2m 16s
Release-build [clang-12, cmake-3.11 sanitizer=""]	3m 49s
	1h 16m 4s

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