RFR: 8263185: Mallinfo deprecated in glibc 2.33 [v5]

[Christoph Göttschkes]

> Starting with glibc 2.33, mallinfo is deprecated in favor of the new mallinfo2 API. Both APIs work the same way, the only difference is, that mallinfo2 uses size_t instead of int for the fields of the struct, containing the information about malloc. Please see the [glibc release notes](https://sourceware.org/pipermail/libc-alpha/2021-February/122207.html).
> 
> Testing with tier1 on a system with glibc 2.33 and on a system with glibc 2.31.

Christoph Göttschkes has updated the pull request incrementally with one additional commit since the last revision:

  Copy mallinfo struct definition into VM sources and guard usage.

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/2964/files
  - new: https://git.openjdk.java.net/jdk/pull/2964/files/1dd4ac92..d3b03e63

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=2964&range=04
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=2964&range=03-04

  Stats: 52 lines in 2 files changed: 35 ins; 6 del; 11 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2964.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2964/head:pull/2964

PR: https://git.openjdk.java.net/jdk/pull/2964