fix libetonyek build

KEY2StyleParser.cpp:65:10: error: no matching function for call to 'readNumber'
KEY2StyleParser.cpp:34:13: note: candidate template ignored: couldn't infer template argument 'C'

I took the patch from Fridrich's openSUSE rpms.

Change-Id: Iba3c682539c5c978dddb0040f24f23c7299af0d9