Remove `java.base:include` from `EXTRA_HEADER_DIRS`. The directory contains base versions of the files present in `<build>/support/modules_include/java.base`; the latter is automatically [included in every JDK library build](https://github.com/openjdk/jdk/blob/master/make/autoconf/flags-cflags.m4#L434).
Verified that: - cl.exe command line contains `-I<stuff>/modules_include/java.base` - Windows, Linux and Mac builds still pass ------------- Commit messages: - Remove one more - Simplify includes Changes: https://git.openjdk.org/jdk/pull/9835/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=9835&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8292244 Stats: 6 lines in 2 files changed: 0 ins; 5 del; 1 mod Patch: https://git.openjdk.org/jdk/pull/9835.diff Fetch: git fetch https://git.openjdk.org/jdk pull/9835/head:pull/9835 PR: https://git.openjdk.org/jdk/pull/9835
