Add perl-FindBin dep for fedora

Compilation in fedora fails without this installed with message:

  --- stderr
  Can't locate FindBin.pm in @inc (you may need to install the FindBin module) 
...

Author: JadedBlueEyes

openssl/src/lib.rs

@@ -44,7 +44,7 @@
 //! $ sudo apt-get install pkg-config libssl-dev
 //!
 //! # Fedora
-//! $ sudo dnf install pkg-config openssl-devel
+//! $ sudo dnf install pkg-config perl-FindBin openssl-devel
 //!
 //! # Alpine Linux
 //! $ apk add pkgconfig openssl-dev