Provide up-to-date build instructions for Debian

[jstolarek]

Build instructions for Debian provided in the README.md don't work on Debian 10 (current stable version) and 9 (oldstable version) - see #69 as an example. It would be nice to have up-to-date build instructions.

[aazudd]

Here are the steps I followed to compile FinalHE on debian 9. Hope It will work for debian 10.

2 problems solved by this method :

• sha256.h not found : use a build directory as seen here
• libxml/xxxxx.h not found during make : libxml tree is located under /usr/include/libxml2/

[Everything was done as root]

00· check all the packages needed are installed (libxml2-dev should already be present) 01· mkdir /usr/include/libxml/ 02· cp /usr/include/libxml2/* /usr/include/libxml/ (should work with soft links too) 03· tar xzf finalhe-1.92.tar.gz 04· cd finalhe-1.92 05· mkdir build 06· cd build 07· cmake /path/to/finalhe-1.92 08· make 09· cd ./src 10· ./FinalHE

I used it to H-encore2 a PS Vita @3.73 :)