Add python to PATH for ci script

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Change-Id: I7b20894240611e52b6ba9bfd10cc37e2edb24e1f
Reviewed-on: https://bazel-review.googlesource.com/#/c/4032/
MOS_MIGRATED_REVID=127326078
diff --git a/scripts/ci/windows/compile_windows.sh b/scripts/ci/windows/compile_windows.sh
index 3744afe..646efa8 100755
--- a/scripts/ci/windows/compile_windows.sh
+++ b/scripts/ci/windows/compile_windows.sh
@@ -35,6 +35,7 @@
 # These variables are temporarily needed for Bazel
 export BAZEL_SH="$(cygpath --windows /bin/bash)"
 export TMPDIR=${TMPDIR:-c:/bazel_ci/temp}
+export PATH="${PATH}:/c/python_27_amd64/files"
 mkdir -p "${TMPDIR}"  # mkdir does work with a path starting with 'c:/', wow
 
 # Even though there are no quotes around $* in the .bat file, arguments