Must keep microsoft VS_PATH on PATH after toolchain detection

log: http://scaaa268.us.oracle.com:8080/hudson/job/9-2-build-windows-i586-cygwin/84/console
configure: Rewriting MT to "/cygdrive/c/progra~2/micros~1/windows/v7.0a/bin/mt"
checking for rc... /cygdrive/c/Program Files (x86)/Microsoft SDKs/Windows/v7.0A/bin/rc
configure: Rewriting RC to "/cygdrive/c/progra~2/micros~1/windows/v7.0a/bin/rc"
checking for dumpbin... dumpbin
configure: Rewriting DUMPBIN to "/cygdrive/c/progra~2/micros~2.0/vc/bin/dumpbin"
checking for gobjdump... no
checking for objdump... objdump
configure: Rewriting OBJDUMP to "/usr/bin/objdump"
configure: error: Target CPU mismatch. We are building for x86 but CL is for "directory"; expected "80x86".
configure exiting with result code 1

log: http://scaaa268.us.oracle.com:8080/hudson/job/9-2-build-windows-amd64-cygwin/90/console
checking for Corporate Code Signing Application... C:/UTILS
checking for wscript... /cygdrive/c/Windows/system32/wscript
checking for cscript... /cygdrive/c/Windows/system32/cscript
checking for msicert... /cygdrive/c/utils/msicert
checking for msitran... /cygdrive/c/utils/msitran
checking for midl... no
cygpath: can't convert empty path
cygpath: can't convert empty path
configure: The path of MIDL, which resolves as "", is not found.
configure: error: Cannot locate the the path of MIDL
configure exiting with result code 1

other arches is OK.

The yesterday's build is OK;

this hg tips: http://rehudson.us.oracle.com/nightlyws/jdk9-dev/b04_2014-02-24-1601_126/report/
yesterday hg tips: http://rehudson.us.oracle.com/nightlyws/jdk9-dev/b04_2014-02-23-1602_123/report/