tried this in 743c53eb but forgot add the changes there

Add missing dlls to Windows installer, add dynamic lib extensions for Windows and OSX to scripts/load_all_binaries.pd

* fix typo introduced into tar_em_up.sh
* remove flext and rtcmix from LIB_TARGETS
* selectively compile disis classes on Windows
* use Program Files (x86) for win64

first shot at setting up the correct libs for Gem (have to put them in build/bin so that the dynamic loader finds them)

port agraef's commit from Pd-l2ork: Add arduino folder to the tarball installer. commit 8c75a53e66cba080776ac6ff5b5be01da92172ee

port agraef's commit from Pd-l2ork: Make 'tar_em_up.sh -B -n' do the right thing, by moving the extra staging done by 'make deb' into a separate 'debstage' target. commit 73bf25e1dd5bd2dd37e04e7e163855d440542e43

port bccbccc9bb53cdc7f2e5238345f69fd754507595 from Pd-l2ork: finally fixed control file for both pre and post 15.10 Ubuntu due to libgsl

port b39417b3d4676fb3275aa31be934fe776718504c from Pd-l2ork: experimental improvements to the Linux build to make it compatible with Ubuntu 16.04

port e3e30ff94964fddd5764fd64391dcf8216354264 from Pd-l2ork: forgot to convert configure.in to configure.ac

The old path was /usr/local/bin, but I think Hans was manually adding the dlls there. If not we can use an ifdef to set this specifically for use with msys2

comment out some dlls for building on Windows with msys2 (we'll see if it turns out we need them later when testing)

*added lyon to default path
(ported manually, left out control file since it was ported in a previous manual port...)

*updated dependencies that reflect rtcmix~ external needs

*forgot to add two files

 *hopefully fixed the remaining conflicts between pd-extended deb and pd-l2ork deb

 *fixed potential package conflict with old pd-extended due to Gem includes. Moved them to /usr/include/pd-l2ork/Gem/ instead of /usr/include/Gem