* libgcov.c (create_file_directory): New function. Create
directory for the given file name.
(gcov_max_filename): New static var. Keeps size of the longest
file name.
(gcov_exit): Always try to create directory for output
file. Relocate each filename basing on environment vars.
(__gcov_init): Remember the longest file name.
* tsystem.h: include filenames.h to get IS_DIR_SEPARATOR
* doc/gcov.texi (Cross-profiling): New node documenting
cross-profiling management.
* doc/invoke.texi (-fprofile-arcs): Add xref to cross-profiling.
From-SVN: r99523
