Use `mkdir -p` when creating `/usr/bin`
Use `mkdir -p` when creating `/usr/bin`

When QT_DIR_NAME is altered, /usr/bin` is checked. This directory
is more often than not already created. Hence `mkdir` with `-p` should
be used. Currently it results in a build failure since the directory
already exists.

Signed-off-by: Adam YH Lee <aa28ee08db6737a718bd8454760cefe8d54c851d@gmail.com>
Signed-off-by: Martin Jansa <516df3ff67e1fa5d153800b15fb204c0a1a389dc@gmail.com>

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