Add libusb dylib to binary so Trezor will work

Closes: #3946

contrib/build-osx/make_osx

@@ -59,6 +59,12 @@ done
 cp -R $BUILDDIR/electrum-locale/locale/ ./lib/locale/
 cp    $BUILDDIR/electrum-icons/icons_rc.py ./gui/qt/
 
+
+info "Downloading libusb..."
+curl https://homebrew.bintray.com/bottles/libusb-1.0.21.el_capitan.bottle.tar.gz | \
+tar xz --directory $BUILDDIR
+cp $BUILDDIR/libusb/1.0.21/lib/libusb-1.0.dylib contrib/build-osx
+
 info "Installing requirements..."
 python3 -m pip install -Ir ./contrib/deterministic-build/requirements.txt --user && \
 python3 -m pip install -Ir ./contrib/deterministic-build/requirements-binaries.txt --user || \

contrib/build-osx/osx.spec

@@ -40,20 +40,12 @@ datas += collect_data_files('trezorlib')
 datas += collect_data_files('btchip')
 datas += collect_data_files('keepkeylib')
 
-# We had an issue with PyQt 5.10 not picking up the libqmacstyles.dylib properly,
-# and thus Electrum looking terrible on Mac.
-# The below 3 statements are a workaround for that issue.
-# This should 'do nothing bad' in any case should a future version of PyQt5 not even
-# need this.
-binaries = []
-dylibs_in_pyqt5 = collect_dynamic_libs('PyQt5', 'DUMMY_NOT_USED')
-for tuple in dylibs_in_pyqt5:
-    # find libqmacstyle.dylib ...
-    if "libqmacstyle.dylib" in tuple[0]:
-        # .. and include all the .dylibs in that dir in our 'binaries' PyInstaller spec
-        binaries += [( os.path.dirname(tuple[0]) + '/*.dylib', 'PyQt5/Qt/plugins/styles' )]
-        break
- 
+# Add libusb so Trezor will work
+binaries = [(electrum + "contrib/build-osx/libusb-1.0.dylib", ".")]
+
+# Workaround for "Retro Look":
+binaries += [b for b in collect_dynamic_libs('PyQt5') if 'macstyle' in b[0]]
+
 # We don't put these files in to actually include them in the script but to make the Analysis method scan them for imports
 a = Analysis([electrum+MAIN_SCRIPT,
               electrum+'gui/qt/main_window.py',