We constantly had to adjust the qmake grammar to handle line
continuations (\\\n) in weird places. Instead of doing that,
just do a preprocess step to remove all the LCs like we do with
comments, and simplify the grammar not to take into account the
LCs.
From some manual testing it doesn't look like we get any regressions.
Change-Id: I2017d59396004cf67b6cb54977583db65c65e7d3
Reviewed-by: Tobias Hunger <tobias.hunger@qt.io>
Warn on broken line continuation in .pro-files, but fix up the issue
and proceed.
Change-Id: Ibe68011b312bcea25620ce790a0b44b2983fbd88
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>
