Change Python version in pyinstaller spec file

contrib/build-wine/build-electrum-git.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 
 NAME_ROOT=electrum
-PYTHON_VERSION=3.6.5
+PYTHON_VERSION=3.5.4
 
 # These settings probably don't need any change
 export WINEPREFIX=/opt/wine64

contrib/build-wine/deterministic.spec

@@ -10,7 +10,7 @@ for i, x in enumerate(sys.argv):
 else:
     raise BaseException('no name')
 
-PYTHON_VERSION = '3.6.5'
+PYTHON_VERSION = '3.5.4'
 PYHOME = 'c:/python' + PYTHON_VERSION
 
 home = 'C:\\electrum\\'