[roll] Roll fuchsia [sys] Remove remaining usages of FLAG_POSIX_*

Test: fx test //src/sys/component_manager

Original-Bug: 378924259
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1191813
Original-Revision: 1be5fba4f0ca64570eec5d4e7bc5b6150c1532be
GitOrigin-RevId: 171bb40038e33de86b11632b35a983d90f127195
Change-Id: Ibb2c44b72f432e53c7e6ab1319507601845ec598

Author: Brandon Castellano

stem

@@ -11,7 +11,7 @@
              githooks="integration/git-hooks"
              remote="https://fuchsia.googlesource.com/fuchsia"
              gerrithost="https://fuchsia-review.googlesource.com"
-             revision="05bf2f38e3f3b6e20583edfe241836f55c3fc62f"/>
+             revision="1be5fba4f0ca64570eec5d4e7bc5b6150c1532be"/>
   </projects>
   <hooks>
     <hook name="install-environment"