updated generic linux build instructions
Issue #1331
new
cd /where/i/keep/my/games/
# legally obtain a gog installer and extract it to caesaria-gog-data
innoextract setup_caesar3_2.0.0.9.exe -d caesaria-gog-data
# clone and build caesaria
git clone https://bitbucket.org/dalerank/caesaria.git
cd caesaria
cmake .
make -j4
# start the game you just built, using the gog c3 game data
./bin/caesaria.linux -c3gfx ../caesaria-gog-data/app -c3music ../caesaria-gog-data/wavs -c3video../caesaria-gog-data/smk