Check libraries before Qt version

Importing qtutils for version_check needs pkg_resources, so we need to check
that's available earlier.

Also, import pkg_resources also shows warnings on older setuptools versions
because of invalid escapes, so we need to import it with warnings suppressed.

qutebrowser/misc/earlyinit.py

@@ -349,9 +349,9 @@ def earlyinit(args):
     # Now we can be sure QtCore is available, so we can print dialogs on
     # errors, so people only using the GUI notice them as well.
     backend = get_backend(args)
+    check_libraries(backend)
     check_qt_version()
     remove_inputhook()
-    check_libraries(backend)
     check_ssl_support(backend)
     check_optimize_flag()
     set_backend(backend)

qutebrowser/utils/qtutils.py

@@ -31,6 +31,7 @@ import io
 import operator
 import contextlib
 
+import pkg_resources
 from PyQt5.QtCore import (qVersion, QEventLoop, QDataStream, QByteArray,
                           QIODevice, QSaveFile, QT_VERSION_STR)
 try:
@@ -38,17 +39,6 @@ try:
 except ImportError:  # pragma: no cover
     qWebKitVersion = None
 
-from qutebrowser.utils import log
-
-with log.ignore_py_warnings(category=PendingDeprecationWarning, module='imp'):
-    with log.ignore_py_warnings(category=ImportWarning):
-        # This imports 'imp' and gives us a PendingDeprecationWarning on
-        # Debian Jessie.
-        #
-        # On Archlinux, we get ImportWarning from
-        # importlib/_bootstrap_external.py for modules with missing __init__.
-        import pkg_resources
-
 
 MAXVALS = {
     'int': 2 ** 31 - 1,