qt: Pick translation messages only from necessary files

Utility libraries (common, util) as well as extra tools shouldn't be
parsed for translation messages, only the server and wallet part qualify
here.

share/qt/extract_strings_qt.py

@@ -7,8 +7,9 @@ from subprocess import Popen, PIPE
 import glob
 import operator
 import os
+import sys
 
-OUT_CPP="src/qt/bitcoinstrings.cpp"
+OUT_CPP="qt/bitcoinstrings.cpp"
 EMPTY=['""']
 
 def parse_po(text):
@@ -47,7 +48,7 @@ def parse_po(text):
 
     return messages
 
-files = glob.glob('src/*.cpp') + glob.glob('src/*.h') 
+files = sys.argv[1:]
 
 # xgettext -n --keyword=_ $FILES
 XGETTEXT=os.getenv('XGETTEXT', 'xgettext')