[jdk13u-dev] RFR: 8232084: HotSpot build failed with GCC 9.2.1

[Yuri Nesterenko]

Following discussion after https://mail.openjdk.java.net/pipermail/jdk-updates-dev/2021-May/006150.html, in addition to the original fix I have disabled gcc warninig "stringop-truncation" for lcms in Awt2dLibraries.gmk and for dt_socket in Lib-jdk.jdwp.agent.gmk.
A problem with jvmti_tools.c doesn't exist in jdk13 after JDK-8209611

Verified on Ubuntu 20.04 with gcc 9.3.0 and Ubuntu 18.04 with gcc 7.5.0, release and fastdebug builds of "images" and "test-image" targets, tier1 and separately vmTestbase tests.

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Commit messages:
 - Backport 11fbd78f27a338af850256a468a93dc257a4d3ac

Changes: https://git.openjdk.java.net/jdk13u-dev/pull/207/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk13u-dev&pr=207&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8232084
  Stats: 20 lines in 6 files changed: 18 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk13u-dev/pull/207.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk13u-dev pull/207/head:pull/207

PR: https://git.openjdk.java.net/jdk13u-dev/pull/207