0.19.3

A bug fix release for executable rewrites, symbol version definitions, and zsh
completion.

Bug fixes

• Fix overlapping load segment mappings when growing an executable's interpreter
  and then rewriting its RPATH. Preserve writable coverage of .dynamic so the
  dynamic loader can update DT_DEBUG, fixing crashes in musl bootstrap GCC and
  GNAT (#672).
• Reuse the header load segment for further growth and reserve enough file and
  virtual address space after strip removes padding, preventing later rewrites
  from overlapping mappings or corrupting section contents (#672).
• Keep the program header table covered by a load segment when repeated
  executable rewrites split note segments and grow the table. This fixes invalid
  PHDR coverage on x86_64 and an assertion failure on AArch64, including when
  patching Grpc.Tools binaries (#675, #679).
• Update DT_VERDEF when .gnu.version_d is relocated, preventing the dynamic
  loader from following stale symbol version definitions and crashing before
  the program starts (#664, #665).
• Fix zsh completion of options, OS ABI names, input files, library names, and
  colon-separated directory lists (#677).

Verification and remaining limits

Source and generated source-tarball test suites each passed 71 tests with 4 skips.
The 224-input reproduction matrix has no new failures. Exact Grpc.Tools and
OpenCode reproductions pass on x86_64 and AArch64. Isolated dummy-JACK checks
cover Pianoteq audio generation, Audacity recording, and REAPER/Renoise connections.

Bitwig Studio 6.1.4 reaches its license screen, but its main/JACK case remains
unverified. Physical audio hardware and complete downstream package rebuilds
were not tested. Insync's debug-only QtWebEngineProcess.debug still rejects
patching with data offset extends past file end; retain the package workaround
that skips/removes that debug-only object.

Full changelog: 0.19.2...0.19.3