Update to libc 0.2.78.

Author: sunfishcode

Cargo.toml

@@ -26,7 +26,7 @@ rand = "0.7.3"
 tempfile = "3.1.0"
 
 [target.'cfg(not(windows))'.dev-dependencies]
-libc = "0.2.77"
+libc = "0.2.78"
 
 [target.'cfg(windows)'.dev-dependencies]
 # nt_version uses internal Windows APIs, however we're only using it

cap-directories/Cargo.toml

@@ -18,7 +18,7 @@ cap-std = { path = "../cap-std", version = "^0.4.1-alpha.0"}
 directories = "3.0.1"
 
 [target.'cfg(not(windows))'.dependencies]
-libc = "0.2.77"
+libc = "0.2.78"
 
 [target.'cfg(windows)'.dependencies]
 winapi = "0.3.9"

cap-primitives/Cargo.toml

@@ -20,7 +20,7 @@ fs-set-times = "0.2.0"
 
 [target.'cfg(not(windows))'.dependencies]
 posish = "0.3.0"
-libc = "0.2.77"
+libc = "0.2.78"
 
 [target.'cfg(target_os = "linux")'.dependencies]
 lazy_static = "1.4.0"