[Libffi] Upgrade to v3.4.4 (#5834)

* [Libffi] Upgrade to v3.4.4

* [Libffi] Require GCC 6, needed for generating assembly for 32-bit Win

L/Libffi/build_tarballs.jl

@@ -1,32 +1,32 @@
 using BinaryBuilder
 
 name = "Libffi"
-version = v"3.2.1"
-
+upstream_version = "3.4.4"
+version = VersionNumber(upstream_version)
 
 # Collection of sources required to build libffi
 sources = [
-    ArchiveSource("https://sourceware.org/pub/libffi/libffi-$(version).tar.gz",
-                  "d06ebb8e1d9a22d19e38d63fdb83954253f39bedc5d46232a05645685722ca37"),
-    DirectorySource("./bundled"),
+    ArchiveSource("https://github.com/libffi/libffi/releases/download/v$(upstream_version)/libffi-$(upstream_version).tar.gz",
+                  "d66c56ad259a82cf2a9dfc408b32bf5da52371500b84745f7fb8b645712df676"),
 ]
 
-version = v"3.2.2" # <-- this is a lie, we need to bump the version to require julia v1.6
-
 # Bash recipe for building across all platforms
 script = raw"""
 cd $WORKSPACE/srcdir/libffi-*/
-atomic_patch -p1 ../patches/*
 update_configure_scripts
-autoreconf -f -i
-./configure --prefix=${prefix} --build=${MACHTYPE} --host=${target} --disable-static --enable-shared
+./configure --prefix=${prefix} \
+    --build=${MACHTYPE} \
+    --host=${target} \
+    --disable-static \
+    --enable-shared \
+    --disable-multi-os-directory
 make -j${nproc}
 make install
 """
 
 # These are the platforms we will build for by default, unless further
 # platforms are passed in on the command line
-platforms = supported_platforms(; experimental=true)
+platforms = supported_platforms()
 
 # The products that we will ensure are always built
 products = [
@@ -38,4 +38,4 @@ dependencies = Dependency[
 ]
 
 # Build the tarballs, and possibly a `build.jl` as well.
-build_tarballs(ARGS, name, version, sources, script, platforms, products, dependencies; julia_compat="1.6")
+build_tarballs(ARGS, name, version, sources, script, platforms, products, dependencies; julia_compat="1.6", preferred_gcc_version=v"6")