improved dynamic linking #382

Job	Run time
rust_clippy_check_ubuntu	6m 34s
rustfmt_check (ubuntu-latest)	8s
rustfmt_check (macos-latest)	11s
rustfmt_check (windows-latest)	38s
build_dynamic_and_test_ubuntu	3m 4s
build_dynamic_and_test_macos	2m 59s
build_static_and_test_ubuntu	6m 49s
rust_clippy_check_windows	21m 7s
build_static_and_test_ubuntu_with_system_ffmpeg	1m 44s
build_with_vcpkg_ffmpeg_windows (x86_64-pc-windows-msvc, x64-windows, true)	20m 31s
build_dynamic_and_test_windows_pre	3m 57s
build_with_vcpkg_ffmpeg_windows (i686-pc-windows-msvc, x86-windows, true)	19m 21s
build_with_vcpkg_ffmpeg_windows (x86_64-pc-windows-msvc, x64-windows-static, -Ctarget-feature=+cr...	20m 53s
docs_rs_check	1m 40s
build_with_vcpkg_ffmpeg_windows (i686-pc-windows-msvc, x86-windows-static, -Ctarget-feature=+crt-...	19m 1s
build_with_vcpkg_ffmpeg_windows (i686-pc-windows-msvc, x86-windows-static-md)	18m 18s
build_with_vcpkg_ffmpeg_windows (x86_64-pc-windows-msvc, x64-windows-static-md)	20m 2s
build_dynamic_and_test_windows	1m 21s
	2h 48m 18s

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