Disable Windows OpenJ9 Java 8 builds temporarily

Reverts eclipse-openj9#915 which is specific to
IBM's internal builds, due to
eclipse-openj9#938 until machines are fixed
to have Visual Studio 10 SP1

Signed-off-by: Peter Shipton <Peter_Shipton@ca.ibm.com>

buildspecs/win_x86-64_cmprssptrs.spec

@@ -136,7 +136,6 @@
 		<flag id="build_java9" value="true"/>
 		<flag id="build_newCompiler" value="true"/>
 		<flag id="build_openj9" value="true"/>
-		<flag id="build_openj9JDK8" value="true"/>
 		<flag id="build_ouncemake" value="true"/>
 		<flag id="build_product" value="true"/>
 		<flag id="env_littleEndian" value="true"/>