Issue: 993.  Thank you Daniel for the patch.  Two changes to the patch are explained in the Issue Report.

git-svn-id: svn://dev.exiv2.org/svn@3371 b7c8b350-86e7-0310-a4b4-de8f6a8f16a3
#697.  config/ConfigureChecks.cmake: STRERROR_R_CHAR_P revisited

git-svn-id: svn://dev.exiv2.org/svn@3372 b7c8b350-86e7-0310-a4b4-de8f6a8f16a3
Fix cygwin compilation warning on geotag.cpp

git-svn-id: svn://dev.exiv2.org/svn@3373 b7c8b350-86e7-0310-a4b4-de8f6a8f16a3