Fix dnf runtine requirements packages

[agravelot]

What kind of change does this PR introduce?

Typo in runtime dependencies for Fedora/CentOS distro.

What is the current behavior?

$ LANG=C sudo dnf install libx11-devel libxcursor-devel libpng-devel
Last metadata expiration check: 0:04:01 ago on Thu Nov 26 21:31:55 2020.
No match for argument: libx11-devel
  * Maybe you meant: libX11-devel
No match for argument: libxcursor-devel
  * Maybe you meant: libXcursor-devel
Package libpng-devel-2:1.6.37-6.fc33.x86_64 is already installed.
Error: Unable to find a match: libx11-devel libxcursor-devel

What is the new behavior?

$ LANG=C sudo dnf install libX11-devel libXcursor-devel libpng-devel
Last metadata expiration check: 0:09:04 ago on Thu Nov 26 21:39:41 2020.
Package libX11-devel-1.6.12-3.fc33.x86_64 is already installed.
Package libXcursor-devel-1.2.0-3.fc33.x86_64 is already installed.
Package libpng-devel-2:1.6.37-6.fc33.x86_64 is already installed.
Dependencies resolved.
Nothing to do.
Complete!

What steps did you take to test this? This is required before I can merge, make sure to test the flow you've updated.

1. sudo dnf install libX11-devel libXcursor-devel libpng-devel

Checklist

• Documentation
• Testing
• Ready to be merged
  
• Added myself to contributors table