Remove Visual Studio solutions below VS 2015 #249

Job	Run time
host_unix (ubuntu-latest, clang)	3m 5s
host_qemu (armv7, gcc)	30m 13s
host_unix (ubuntu-24.04-arm, clang)	2m 48s
host_unix (macos-latest, gcc)	1m 41s
host_unix (ubuntu-latest, gcc)	2m 52s
host_unix (macos-latest, clang)	1m 27s
host_unix (ubuntu-24.04-arm, gcc)	2m 58s
host_qemu (aarch64, gcc)	31m 17s
	1h 16m 21s

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