Commits on Mar 31, 2022

1. libtool: fix /usr/bin/file impurity affecting cross-compilation …

   libtool's libtool.m4 script assumes that `file` is available, and can
   be found at `/usr/bin/file` (this path is hardwired).  Furthermore,
   the script with this assumption is vendored into the ./configure
   scripts of an enormous number of packages.
   
   This commit makes two changes:
   
     * It adds a `substituteInPlace` in the `libtool` expression so that
       autoreconfHook'ed packages will find `file` in the correct
       location.  This is currently guarded by a check for
       cross-compilation in order to prevent mass-rebuilds.
   
     * It adds a top-level `fixPathToUsrBinFileInConfigureScript` to
       `substituteInPlace` the `./configure` script of packages directly,
       for use with packages which would break if autoreconfHook'ed.
   
   This commit allows the mips64el-linux-gnuabi64 bootstrap-files to be
   built in a sandbox (as required by Hydra) by implementing the two
   changes above, adding `autoreconfHook` to `gmp`, `pcre`, `isl`, and
   `libmpc`, as well as adding `fixPathToUsrBinFileInConfigureScript` to
   `mpfr` (since `mpfr` breaks if autoreconf'ed with the latest
   autotools); this was verified with:
   
   ```
     nix-build \
       --option sandbox true \
       --option fallback false \
       pkgs/top-level/release-cross.nix \
       -A bootstrapTools.mips64el-linux-gnuabi64.build
   ```

   Adam Joseph committed Mar 31, 2022
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