64-bit builds won't work with the Xcode-provided nasm.
Explicitly select Homebrew's nasm in this case, so the user's
PATH won't cause the system version to be selected.
jpeg-turbo-1.2.0 can fail `make install` due to a race condition
on Lion using clang, where you get the error that a path exists.
Separate the make steps, and deparallelize the install.
Signed-off-by: Adam Vandenberg <flangy@gmail.com>
libjpeg-turbo is a derivative of libjpeg that uses
SIMD instructions (MMX, SSE2, NEON) to accelerate
baseline JPEG compression and decompression on
x86, x86-64, and ARM systems.
ClosesHomebrew/homebrew#11894.
Signed-off-by: Adam Vandenberg <flangy@gmail.com>
