Failures on SUN Solaris. Buggy compiler there required some extra initialization
for variables. Then the 02 optimization leads to bugs when values set through the
pointer are not always taken into account. Finally, the (long long) / (long)
crashes there, the explicit typeconverstion added.
Failing innodb_plunin.innodb_gis.test fixed.

per-file comments:
  mysql-test/suite/innodb_plugin/t/innodb_gis.test
GIS issues fixed.
  sql/gcalc_slicescan.cc
GIS issues fixed.
  sql/gcalc_tools.cc
GIS issues fixed.