E100: revert unnecessary change to fifo_to_gpmc

This change was intended to remove warnings as only 16 bits of the FIFO bus are used.
However this change has unintentional consequences for receive performance.
Merge branch 'fpga_master' into maint
Bumped up version to 3.5.3
docs: man pages compress fully
Added CMake variables to customize builds to match Debian package configurations

* -DLIBUHD_PKG=ON installs with libuhd003 configuration
* -DLIBUHDDEV_PKG=ON installs with libuhd-dev configuration
* -DUHDHOST_PKG=ON installs with uhd-host configuration
cmake: GCC strips binaries unless build type is specified