qt5: bump to 5.3.2

Only use ccache prefix in QMAKE_CC and QMAKE_CXX since the build system is
broken when QMAKE_AR contains a space character.

Remove the upstreamed uClibc patch.

Signed-off-by: Fatih Aşıcı <fatih.asici@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>