Merge pull request #764 from thomcc/bump-1.0.78

Prep release 1.0.78

Author: Mark-Simulacrum

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "cc"
-version = "1.0.77"
+version = "1.0.78"
 authors = ["Alex Crichton <[email protected]>"]
 license = "MIT OR Apache-2.0"
 repository = "https://github.com/rust-lang/cc-rs"