README.md: Update build instructions

The 'make binaries' command requires the existence of
libc.a.  On Fedora this file is included in the glibc-static
package.  If this is not installed the user will get the error
'/usr/bin/ld: cannot find -lc'.  On Ubuntu this is not an issue.
The README was updated to reflect this dependency.

Signed-off-by: Ryan Cole <rcyoalne@gmail.com>

README.md

@@ -42,7 +42,7 @@ It is currently in active development in the Kubernetes community through the [d
 
 ### Build
 
-`glib2-devel` package on Fedora or ` libglib2.0-dev` on Ubuntu or equivalent is required.
+`glib2-devel` and `glibc-static` packages on Fedora or ` libglib2.0-dev` on Ubuntu or equivalent is required.
 
 
 ```