[jdk15u-dev] RFR: 8295211: Fix autoconf 2.71 warning "AC_CHECK_HEADERS: you should use literals"

[Yuri Nesterenko]

This change does fix the annoying warning on configuration stage. Clean backport.

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Commit messages:
 - Backport c357b5908a091a77bc2b26d74a38785412b88a73

Changes: https://git.openjdk.org/jdk15u-dev/pull/291/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk15u-dev&pr=291&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8295211
  Stats: 31 lines in 1 file changed: 17 ins; 12 del; 2 mod
  Patch: https://git.openjdk.org/jdk15u-dev/pull/291.diff
  Fetch: git fetch https://git.openjdk.org/jdk15u-dev pull/291/head:pull/291

PR: https://git.openjdk.org/jdk15u-dev/pull/291