Uses syscall() to call process_vm_readv in Memory.cpp

The process_vm_readv() function isn't available in Android NDK 16 (it
was first made available in 23, as per https://bit.ly/3412rb7). The
syscall() version was already available, as per https://bit.ly/32Tnyvy.

After this CL, third_party/libunwindstack:libunwindstack compiles! \o/

Bug: 991960
Change-Id: I87bde60511ab15934d7b4d3cdf054e1a4484500b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/third_party/libunwindstack/+/1876906
Reviewed-by: Mike Wittman <wittman@chromium.org>
3 files changed
tree: 4fc7d306a07311f5d6950b952c88faea84f59e62
  1. .clang-format
  2. BUILD.gn
  3. LICENSE
  4. OWNERS
  5. README.chromium
  6. patches/
  7. src/
  8. tools/