Revert to shell test script for test targets
mysqltest.c:
  Windows pclose() returns error code in low byte
mysql_config.sh:
  Remove -Xa -xstrconst from --cflags for Sun C++


scripts/mysql_config.sh:
  Remove -Xa -xstrconst from --cflags for Sun C++
client/mysqltest.c:
  Windows pclose() returns error code in low byte
Makefile.am:
  Revert to shell test script for test targets