[jdk8u-dev] RFR: 8315506: C99 compatibility issue in LinuxNativeDispatcher

[Florian Weimer]

The `Java_sun_nio_fs_LinuxNativeDispatcher_getlinelen` function calls the `free` function without including `<stdlib.h>`. This results in an implicit function declarations, and some compilers no longer support that by default, leading to a build failure.

Per the comment in the file, this function was introduced in the backport from jdk11, so this bug is specific to jdk8u.

Patch originally submitted by @djdelorie as openjdk/jdk8u#42.

Related to:

* https://fedoraproject.org/wiki/Changes/PortingToModernC
* https://fedoraproject.org/wiki/Toolchain/PortingToModernC

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Commit messages:
 - 8315506: C99 compatibility issue in LinuxNativeDispatcher

Changes: https://git.openjdk.org/jdk8u-dev/pull/362/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=362&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8315506
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk8u-dev/pull/362.diff
  Fetch: git fetch https://git.openjdk.org/jdk8u-dev.git pull/362/head:pull/362

PR: https://git.openjdk.org/jdk8u-dev/pull/362