win/mac build: strip parts of pyqt5 from binaries to reduce size (#4901)

When bumping pyinstaller to 3.4, binary sizes had increased drastically.
The main reason seems to be that pyinstaller is pulling in "all" of qt.

based on Electron-Cash/Electron-Cash@4b0996959420dfca3d53f178d86205616d8c568b

contrib/build-wine/deterministic.spec

@@ -78,6 +78,24 @@ for d in a.datas:
         a.datas.remove(d)
         break
 
+# Strip out parts of Qt that we never use. Reduces binary size by tens of MBs. see #4815
+qt_bins2remove=('qt5web', 'qt53d', 'qt5game', 'qt5designer', 'qt5quick',
+                'qt5location', 'qt5test', 'qt5xml', r'pyqt5\qt\qml\qtquick')
+print("Removing Qt binaries:", *qt_bins2remove)
+for x in a.binaries.copy():
+    for r in qt_bins2remove:
+        if x[0].lower().startswith(r):
+            a.binaries.remove(x)
+            print('----> Removed x =', x)
+
+qt_data2remove=(r'pyqt5\qt\translations\qtwebengine_locales', )
+print("Removing Qt datas:", *qt_data2remove)
+for x in a.datas.copy():
+    for r in qt_data2remove:
+        if x[0].lower().startswith(r):
+            a.datas.remove(x)
+            print('----> Removed x =', x)
+
 # hotfix for #3171 (pre-Win10 binaries)
 a.binaries = [x for x in a.binaries if not x[1].lower().startswith(r'c:\windows')]
 

contrib/osx/osx.spec

@@ -81,6 +81,15 @@ for d in a.datas:
         a.datas.remove(d)
         break
 
+# Strip out parts of Qt that we never use. Reduces binary size by tens of MBs. see #4815
+qt_bins2remove=('qtweb', 'qt3d', 'qtgame', 'qtdesigner', 'qtquick', 'qtlocation', 'qttest', 'qtxml')
+print("Removing Qt binaries:", *qt_bins2remove)
+for x in a.binaries.copy():
+    for r in qt_bins2remove:
+        if x[0].lower().startswith(r):
+            a.binaries.remove(x)
+            print('----> Removed x =', x)
+
 pyz = PYZ(a.pure, a.zipped_data, cipher=block_cipher)
 
 exe = EXE(pyz,