myisam spatial code isolated


myisam/mi_create.c:
  spatial code ifdef-ed
myisam/mi_key.c:
  spatial code ifdef-ed
myisam/mi_open.c:
  spatial code ifdef-ed
myisam/mi_range.c:
  spatial code ifdef-ed
myisam/mi_rkey.c:
  spatial code ifdef-ed
myisam/mi_rnext.c:
  spatial code ifdef-ed
myisam/mi_rnext_same.c:
  spatial code ifdef-ed
myisam/rt_index.c:
  spatial code ifdef-ed
myisam/rt_index.h:
  spatial code ifdef-ed
myisam/rt_key.c:
  spatial code ifdef-ed
myisam/rt_key.h:
  spatial code ifdef-ed
myisam/rt_mbr.c:
  spatial code ifdef-ed
myisam/rt_mbr.h:
  spatial code ifdef-ed
myisam/rt_split.c:
  spatial code ifdef-ed
myisam/rt_test.c:
  spatial code ifdef-ed
myisam/sp_defs.h:
  spatial code ifdef-ed
myisam/sp_key.c:
  spatial code ifdef-ed
myisam/sp_test.c:
  spatial code ifdef-ed
sql/spatial.cc:
  spatial code ifdef-ed
sql/spatial.h:
  spatial code ifdef-ed
sql/sql_yacc.yy:
  wrong error messages fixed