OP-1478: move TOOLS_DIR out of linux scope
OP-1478: added a qmake variable SDL_DIR
OP-1478 fix win qtc vairables: fixed TOOLS_DIR check
OP-1478: added a qmake variable OPENSSL_DIR
OP-1478 fix_win_qtc_variables: reworded comments
OP-1478: allow alternate SDL_DIR or OPENSSL_DIR
OP-1478 fix_win_qtc_variables: added MESAWIN_DIR variable
Merge remote-tracking branch 'origin/parched/OP-1478_fix_win_qtc_variables' into next