improve dynamic linking (#139) #385

Job	Run time
rust_clippy_check_ubuntu	7m 30s
rust_clippy_check_windows	20m 7s
build_static_and_test_ubuntu_with_system_ffmpeg	1m 26s
rustfmt_check (ubuntu-latest)	6s
rustfmt_check (windows-latest)	21s
build_static_and_test_ubuntu	6m 19s
rustfmt_check (macos-latest)	10s
build_with_vcpkg_ffmpeg_windows (x86_64-pc-windows-msvc, x64-windows-static-md)	20m 34s
build_with_vcpkg_ffmpeg_windows (x86_64-pc-windows-msvc, x64-windows-static, -Ctarget-feature=+cr...	20m 24s
build_with_vcpkg_ffmpeg_windows (i686-pc-windows-msvc, x86-windows, true)	19m 20s
build_with_vcpkg_ffmpeg_windows (i686-pc-windows-msvc, x86-windows-static-md)	17m 41s
build_with_vcpkg_ffmpeg_windows (x86_64-pc-windows-msvc, x64-windows, true)	20m 11s
build_with_vcpkg_ffmpeg_windows (i686-pc-windows-msvc, x86-windows-static, -Ctarget-feature=+crt-...	18m 16s
build_dynamic_and_test_ubuntu	2m 30s
build_dynamic_and_test_windows_pre	2m 47s
build_dynamic_and_test_macos	2m 47s
docs_rs_check	1m 0s
build_dynamic_and_test_windows	1m 15s
	2h 42m 44s

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