Enable recursive expansion of simple qmake variables

Allow _expand_value to expand variables that may have more than
one level of expansion when the regular expression covers all
of the input. E.g.:

A = Foo
B = $$A/Bar
scope.expand('$$B')

While the original code was able to expand the string '$$B/source.cpp' to
'Foo/Bar/source.cpp', it could not expand the string '$$B' completely.
The latter would always return '$$A/Bar' instead of the expected 'Foo/Bar'
string.

A test case has been added which coveres the above example.

Change-Id: Ie3b5739c24ecbeb67d408dd204b0f54bab1d0f3f
Reviewed-by: Qt CMake Build Bot
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>

0 files changed, 0 insertions, 0 deletions