...since by now we get the defines in the correct format from
QMakeProject.

See the change this one depends on.

Tested with:

    Qbs:   cpp.defines: [ 'PATH1="/some/path"', "PATH2=\"/some/path\"" ]
    QMake: DEFINES += PATH1=\\\"/some/path\\\" "PATH2=\\\"/some/path\\\""
    CMake: add_definitions(-DPATH1="/some/path" "-DPATH2=\"/some/path\"")

All these lines translate to

    #define PATH1 "/some/path"
    #define PATH2 "/some/path"

for the code model.

Change-Id: Ifc3d3acff3abab6897ccbd0c5fafd5c415dfb53c
Reviewed-by: Erik Verbruggen <erik.verbruggen@theqtcompany.com>