fixed file permissions

[Bruno Haible]

Hi,

I removed the execute permission from these files:

  doc/gendocs_template
  lib/fflush.c
  m4/canonicalize-lgpl.m4
  m4/fflush.m4
  modules/canonicalize-lgpl
  modules/fflush
  modules/fflush-tests
  tests/test-base64.c
  tests/test-fflush.c

Bruno