[valgrind] [Bug 437790] valgrind reports "Conditional jump or move depends on uninitialised value" in memchr of macOS 10.15

[Paul Floyd]

https://bugs.kde.org/show_bug.cgi?id=437790

--- Comment #4 from Paul Floyd <pjfloyd at wanadoo.fr> ---
I don't have a 10.15 system to test this with, just an old macbook with 10.7.5
and a newer macbook with 12.

Looking at the code, my guess is that in vg_replace_strmem.c the following
block

# if DARWIN_VERS >= DARWIN_10_10
  MEMCHR(VG_Z_DYLD,                   memchr)
  /* _platform_memchr$VARIANT$Generic */
  MEMCHR(libsystemZuplatformZddylib, _platform_memchr$VARIANT$Generic)
  /* _platform_memchr$VARIANT$Haswell */
  MEMCHR(libsystemZuplatformZddylib, _platform_memchr$VARIANT$Haswell)
# endif

needs to be

# if DARWIN_VERS >= DARWIN_10_10
  MEMCHR(VG_Z_DYLD,                   memchr)
  /* _platform_memchr$VARIANT$Generic */
  MEMCHR(libsystemZuplatformZddylib, _platform_memchr$VARIANT$Generic)
  /* _platform_memchr$VARIANT$Haswell */
  MEMCHR(libsystemZuplatformZddylib, _platform_memchr$VARIANT$Haswell)
# endif
#if DARWIN_VERS >= DARWIN_10_14 /* not sure which version */
  /* _platform_memchr$VARIANT$Base */
  MEMCHR(libsystemZuplatformZddylib, _platform_memchr$VARIANT$Base)
#endif

For the moment I'm just guessing which version added this.

I can't make this change to the sourceware git repo. The last macos version
that is officially supported in 10.13.

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