855253 Compiler error: gcalc_slicescan.cc:2036: error: suggest parentheses around comparison in operand of .|. in maria-5.3-gis
        850775 ST_AREA does not work on GEOMETRYCOLLECTIONs in maria-5.3-gis

per-file comments:
  mysql-test/r/gis.result
        test result updated.
  mysql-test/t/gis.test
        test case added for 850775.
  sql/gcalc_slicescan.cc
        compiler error fixed.
  sql/spatial.cc
        ST_AREA implementation for GEOMETRY_COLLECTION, POINT and LINESTRING.
  sql/spatial.h
        area() declarations added.