RFR: 8377707: [Linux Alpine] Build failure after JDK-8377368

[Matthias Baesken]

On Linux Alpine, we get the following build error:


libproc_impl.h:99:4: error: 'off64_t' does not name a type; did you mean 'off_t'?
   99 | off64_t vdso_offset; // offset of vDSO in core
      | ^~~~~~~
      | off_t


and 


jdk/src/jdk.hotspot.agent/linux/native/libsaproc/ps_core.c:639:11: error: implicit declaration of function 'sendfile64'; did you mean 'sendfile'? [-Wimplicit-function-declaration]
  639 | if (sendfile64(lib_fd, ph->core->core_fd, &ofs, ph->core->vdso_size) == -1) {
      | ^~~~~~~~~~
      | sendfile

-------------

Commit messages:
 - JDK-8377707

Changes: https://git.openjdk.org/jdk/pull/29710/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=29710&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8377707
  Stats: 3 lines in 2 files changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/29710.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29710/head:pull/29710

PR: https://git.openjdk.org/jdk/pull/29710