Fixed wrong variable name for Windows


VC++Files/innobase/innobase.dsp:
  Don't use precompiled headers (doesn't work with samba)
VC++Files/myisammrg/myisammrg.dsp:
  Add missing files
VC++Files/mysqlbinlog/mysqlbinlog.dsp:
  Fixed included paths
VC++Files/mysqldemb/mysqldemb.dsp:
  Don't use precompiled headers (doesn't work with samba)
VC++Files/mysqlserver/mysqlserver.dsp:
  Don't use precompiled headers (doesn't work with samba)
VC++Files/sql/mysqld.dsp:
  Fixed paths
innobase/include/univ.i:
  Removed compiler warning
myisammrg/myrg_open.c:
  Removed compiler warning
sql/ha_myisam.cc:
  Removed compiler warning
  Fixed wrong (but not dangerous) if statement
sql/ha_myisammrg.cc:
  Removed compiler warning
sql/mysqld.cc:
  Fixed wrong variable name for Windows
sql/sql_update.cc:
  Removed not used label