jdk11u build failure on Windows

[Vyom Tiwari]

Hi,
I am facing the build issue with  OpenJDK11(jdk11u). I am trying to build
jdk11u on Windows and I am  getting the below error.

####################
./src/java.base/windows/native/libnet/net_util_md.c(792): error C2065:
'TCP_INITIAL_RTO_NO_SYN_RETRANSMISSIONS': undeclared identifier
make[3]: *** [Lib-java.base.gmk:44:
/cygdrive/d/source/mirrors_github_jdk11u/build/windows-x86_64-normal-server-release/support/native/java.base/libnet/net_util_md.obj]
Error 1
make[3]: *** Waiting for unfinished jobs....
make[2]: *** [make/Main.gmk:215: java.base-libs] Error 2

ERROR: Build failed for target 'images' in configuration
'windows-x86_64-normal-server-release' (exit code 2)
Stopping sjavac server
###################

I found that the back-port of  JDK-8250521
<https://bugs.openjdk.java.net/browse/JDK-8250521>  is causing this failure.

My  environment details are as follows.
OS: Windows Server 2016 Standard, Visual Studio professional 2017 version
15.2(26430.14)

When I updated my Visual Studio to 15.9.42(which contains Windows 10
SDK(10.0.17134.0)) the problem went away.

My question is do we have a minimum supported Visual Studio(15.9.42) to
build jdk11u(11.0.14) ?. If this is not the case then I would like to fix
this build failure.

Thanks,
Vyom