qmake: fix sharedlinkFlags and exelinkflags

[ericLemanissier]

Changelog: Bugfix: The qmake generator now assigns QMAKE_LFLAGS_SHLIB and QMAKE_LFLAGS_APP variables instead of the incorrect QMAKE_LFLAGS following the official docs.
Docs: conan-io/docs#2224

Link to qmake documentation: https://doc.qt.io/qt-5/qmake-variable-reference.html#qmake-lflags-shlib

related to conan-io/conan-center-index#7222

[memsharded]

Looking good.
Link to qmake variables for reference: https://doc.qt.io/qt-5/qmake-variable-reference.html#qmake-lflags-shlib

Is it urgent or blocking? we are going to do a patch 1.40.1 release, worth moving to it?

[ericLemanissier]

it's blocking conan-io/conan-center-index#7222, so the sooner the better

[memsharded]

it's blocking conan-io/conan-center-index#7222, so the sooner the better

Ok, please move if possible the PR to the release/1.40 branch if you can (if you can't dont worry, we will manage). Thanks!

[CLAassistant]

All committers have signed the CLA.

[ericLemanissier]

ok, I think it should be ok now ? nothing messed-up here ?