Remove support for generating folly-config from autoconf for builds with buck

Summary: Support for building Folly with autoconf is going away; this isn't going to keep working, so remove it.

Reviewed By: yfeldblum, philipjameson

Differential Revision: D9569019

fbshipit-source-id: 1fe99453c741ff9fc8632bbcfdd69df6b1f86d01

folly/build/buck_run_autoconf.sh

-#!/bin/sh
-
-get_ldflags() {
-  # Convert paths to .so/.dylib/.dll into directories that can be used with
-  # -L/path and -Wl,-rpath,/path compiler args. Also strip out -l flags,
-  # as autoconf will add them for us for feature detection.
-  for i in "$@"; do
-    if [ "$i" = "-Wl,-rpath" ]; then continue; fi
-    echo "$i" | perl -p -e "s/'/\\\\'/g;" \
-      -e 's/-l[\w-]*//g;' \
-      -e 's;(.*)[/\\].*\.(so|dylib|dll)$;-L\1 -Wl,-rpath,\1;g;'
-  done
-}
-
-# This is an extra linker flag that buck appends on OSX that's not valid
-# This probably requires a patch to buck
-LDFLAGS=$(get_ldflags "$@" | uniq | tr '\n' ' ' | perl -pe 's;-Xlinker \@executable_path\S*;;g')
-
-export LDFLAGS
-export BOOST_LDFLAGS="$LDFLAGS"
-export BOOST_CPPFLAGS="$CPPFLAGS"
-
-SRCROOT=$(dirname "$(readlink "$SRCDIR"/configure.ac)")
-# Temp dir because autoconf doesn't like '#' in the working directory
-conf_dir=$(mktemp -d)
-trap 'rm -rf "$conf_dir"' EXIT
-cd "$conf_dir" && \
-autoreconf -iv "$SRCROOT" && \
-"$SRCROOT/configure" "$BOOST_FLAG" && \
-cp -pvf folly-config.h "$OUT"