RFR: 8291454: Missing check for JLI C runtime library in CoreLibraries.gmk

[Julian Waters]

CoreLibraries.gmk is missing a check for MSVCR_DLL. This results in a defined, but empty macro in libjli if it is not defined in the build system, which is incorrect

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Commit messages:
 - Add missing check in JLI macro definitions

Changes: https://git.openjdk.org/jdk/pull/9669/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=9669&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8291454
  Stats: 4 lines in 1 file changed: 2 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/9669.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9669/head:pull/9669

PR: https://git.openjdk.org/jdk/pull/9669