[FFLAS_FFPACK] New recipe (#9661)

* First attempt

* Removed Manifest.toml

* Removed the -mfpmath=sse option that caused confusion; renamed FFLAS-FFPACK to FFLAS_FFPACK

* Really zapped all the sse stuff from m4 files

* Added libblastrampoline_jll to dependencies, and proper check

* Removed aarch64-freebsd from builds

* Put back aarch64-freebsd

* Added executable product

* Removed expand_cxxstring_abis

* Removed config file from products

* Made it header-only (AnyPlatform())

* Fix comma

* Put back the build to all separate platforms

F/FFLAS_FFPACK/build_tarballs.jl

@@ -0,0 +1,50 @@
+# Note that this script can accept some limited command-line arguments, run
+# `julia build_tarballs.jl --help` to see a usage message.
+using BinaryBuilder, Pkg
+
+name = "FFLAS_FFPACK"
+version = v"2.5.0"
+
+# Collection of sources required to complete build
+sources = [
+    ArchiveSource("https://github.com/linbox-team/fflas-ffpack/releases/download/v$version/fflas-ffpack-$version.tar.gz", "dafb4c0835824d28e4f823748579be6e4c8889c9570c6ce9cce1e186c3ebbb23"),
+    DirectorySource("./bundled")
+]
+
+# Bash recipe for building across all platforms
+script = raw"""
+cd ${WORKSPACE}/srcdir/fflas-ffpack-*
+
+for f in ${WORKSPACE}/srcdir/patches/*.patch; do
+    atomic_patch -p1 ${f}
+done
+
+autoreconf
+./configure CCNAM=${CC} CPLUS_INCLUDE_PATH=$includedir --prefix=$prefix --build=${MACHTYPE} --host=${target}
+
+make -j ${nproc}
+make install
+
+install_license COPYING
+"""
+
+# These are the platforms we will build for by default, unless further
+# platforms are passed in on the command line. Windows is excluded because it doesn't build for the Givaro dependency.
+platforms = supported_platforms(exclude=Sys.iswindows)
+
+# The products that we will ensure are always built
+products = [
+    FileProduct("bin/fflas-ffpack-config", :fflas_ffpack_config),
+    FileProduct("include/fflas-ffpack/fflas-ffpack-config.h", :fflas_ffpack_config_h)
+]
+
+# Dependencies that must be installed before this package can be built
+dependencies = [
+    Dependency("GMP_jll"; compat="6.2.1"),
+    Dependency("Givaro_jll"; compat="4.2.0"),
+    Dependency("libblastrampoline_jll"; compat="5.4.0")
+]
+
+# Build the tarballs, and possibly a `build.jl` as well.
+build_tarballs(ARGS, name, version, sources, script, platforms, products, dependencies;
+    clang_use_lld=false, julia_compat="1.9", preferred_gcc_version=v"6")