windows/requirements: add apr source deb-src

NSIS is built from sources
gui, mingw: link against imm32 and winmm

Qt build with latest MXE (c85476ccd45ad)
with MinGW-w64 depends on imm32 and winmm.

Probabaly build of NPGe for Windows should
depend of specific commit of MXE.
scripts all-steps.sh start with apt-get update

Some packages from apt cache can be removed from apt server
(replaced with newer versions).
gui: fix MOC errors in MinGW-w64

MOC does not like some boost headers.
These headers are now included inside #ifndef Q_MOC_RUN