Synchronize with meh/rust-ffmpeg-sys#16

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rib wants to merge 12 commits intozmwangx:masterfrom

rib:rust-ffmpeg-sys-zmwangx-meh-sync

Commits on Mar 3, 2021

chore: add nix-shell stuff

meh
authored and
rib
committed
Fix incorrect static inline function

ldm0
authored and
rib
committed
Spawn a new thread with a larger stack perform build script work in

semicoleon
authored and
rib
committed
fix: disable optimizations for debug builds

thedataking
authored and
rib
committed
Conditionally add hwcontext_drm header via feature
rib
committed
Fix include paths, stdc++ on macOS

kornelski
authored and
rib
committed
Cargo fmt
rib
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Copy Travis CI config from meh/rust-ffmpeg-sys
rib
committed
Cargo.toml: Specify readme
rib
committed
Bump bindgen version to 0.56
rib
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Update README.md
rib
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Cargo.toml: rename back to ffmpeg-sys
rib
committed