Sebastian Holtermann authored Jan 25, 2019 and Brad King committed Jan 28, 2019

Since commit 5990ecb7 (Compute implicit include directories from
compiler output, 2018-12-07) we now have compiler implicit include
directory computation for gcc and clang.  It should be safe now to pass
these to `moc`.  This patch re-enables passing the compiler implicit
include directories to `moc`, which was disabled due to issue #18669.

Fixes: #18041
Issue: #18669