strtod will break some GLES drivers horribly when encountering Scandinavian-style floating point, ie, 0,5 instead of 0.5. Force C locale

Signed-off-by: Carsten Munk <carsten.munk@jollamobile.com>
Merge pull request #103 from stskeeps/strtod_scandinavia

strtod will break some GLES drivers horribly when encountering Scandinav...