bug#36172: 27.0.50; linking error in git head on macos: _aligned_alloc

[Sam Steingold]

make bootstrap fails with:

--8<---------------cut here---------------start------------->8---
rm -f bootstrap-emacs.pdmp
./temacs --batch  -l loadup --temacs=pbootstrap
dyld: lazy symbol binding failed: Symbol not found: _aligned_alloc
  Referenced from: /Users/sam.steingold/src/emacs/trunk/build/src/./temacs
  Expected in: /usr/lib/libSystem.B.dylib

dyld: Symbol not found: _aligned_alloc
  Referenced from: /Users/sam.steingold/src/emacs/trunk/build/src/./temacs
  Expected in: /usr/lib/libSystem.B.dylib

make[2]: *** [bootstrap-emacs.pdmp] Abort trap: 6
--8<---------------cut here---------------end--------------->8---


In GNU Emacs 27.0.50 (build 7, x86_64-apple-darwin18.6.0, NS appkit-1671.50 
Version 10.14.5 (Build 18F203))
 of 2019-06-05 built on BZ-C02XR5CGJG5L
Repository revision: 7ad5e3915fe0fad7c8053b53cab1aa7aa74193fe
Repository branch: master
Windowing system distributor 'Apple', version 10.3.1671
System Description:  Mac OS X 10.14.5

Configured using:
 'configure --with-mailutils --with-ns
 
PKG_CONFIG_PATH=/usr/local/opt/libxml2/lib/pkgconfig:/usr/local/opt/imagemagick/lib/pkgconfig:/usr/local/opt/gnutls/lib/pkgconfig:/usr/local/opt/jansson/lib/pkgconfig'

Configured features:
NOTIFY KQUEUE ACL GNUTLS LIBXML2 ZLIB TOOLKIT_SCROLL_BARS NS THREADS
JSON PDUMPER LCMS2 GMP

Important settings:
  value of $LANG: C
  locale-coding-system: utf-8-unix

Load-path shadows:
None found.

-- 
Sam Steingold (http://sds.podval.org/) on darwin Ns 10.3.1671
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