RFR: 8324347: Enable "maybe-uninitialized" warning for FreeType 2.13.1

[Sergey Bylokhov]

The next bug in freetype was fixed upstream and fix already merged to OpeenJDK:
https://gitlab.freedesktop.org/freetype/freetype/-/issues/1245
So now we can revert the workaround in the JDK:
https://bugs.openjdk.org/browse/JDK-8313576

Tested with "--with-freetype=bundled", "--with-freetype=system" and w/o option on the system where the bug was reproduced.

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Commit messages:
 - Revert "8313576: GCC 7 reports compiler warning in bundled freetype 2.13.0"

Changes: https://git.openjdk.org/jdk/pull/17525/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17525&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8324347
  Stats: 2 lines in 1 file changed: 0 ins; 2 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/17525.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17525/head:pull/17525

PR: https://git.openjdk.org/jdk/pull/17525