libffi: Add patch to fix building with clang

packages/libffi/build.sh

@@ -2,14 +2,5 @@ TERMUX_PKG_HOMEPAGE=https://sourceware.org/libffi/
 TERMUX_PKG_DESCRIPTION="Library providing a portable, high level programming interface to various calling conventions"
 TERMUX_PKG_VERSION=3.2.1
 TERMUX_PKG_SRCURL=ftp://sourceware.org/pub/libffi/libffi-${TERMUX_PKG_VERSION}.tar.gz
+TERMUX_PKG_EXTRA_CONFIGURE_ARGS="--disable-multi-os-directory"
 TERMUX_PKG_RM_AFTER_INSTALL="lib/libffi-${TERMUX_PKG_VERSION}/include"
-
-termux_step_post_make_install () {
-	if [ $TERMUX_ARCH_BITS = "64" ]; then
-		# Avoid libffi being placed in lib64 for 64-bit builds:
-		mv $TERMUX_PREFIX/lib64/libffi* $TERMUX_PREFIX/lib/
-
-		perl -p -i -e 's|lib/../lib64|lib|' $TERMUX_PREFIX/lib/pkgconfig/libffi.pc
-		perl -p -i -e 's|lib/../lib64|lib|' $TERMUX_PREFIX/lib/libffi.la
-	fi
-}

packages/libffi/configure.ac.patch

@@ -0,0 +1,87 @@
+From
+  https://github.com/chef/omnibus-software/blob/master/config/patches/libffi/libffi-3.2.1-disable-multi-os-directory.patch
+, this change will be included in the next libffi release.
+
+--- libffi-3.2.1-orig/configure.ac	2014-11-12 05:56:51.000000000 -0600
++++ libffi-3.2.1/configure.ac	2015-10-29 15:53:41.695055040 -0500
+@@ -590,6 +590,10 @@
+     AC_DEFINE(USING_PURIFY, 1, [Define this if you are using Purify and want to suppress spurious messages.])
+   fi)
+ 
++AC_ARG_ENABLE(multi-os-directory,
++[  --disable-multi-os-directory
++                          disable use of gcc --print-multi-os-directory to change the library installation directory])
++                          
+ # These variables are only ever used when we cross-build to X86_WIN32.
+ # And we only support this with GCC, so...
+ if test "x$GCC" = "xyes"; then
+@@ -601,11 +605,13 @@
+     toolexecdir="${libdir}"/gcc-lib/'$(target_alias)'
+     toolexeclibdir="${libdir}"
+   fi
+-  multi_os_directory=`$CC $CFLAGS -print-multi-os-directory`
+-  case $multi_os_directory in
+-    .) ;; # Avoid trailing /.
+-    ../*) toolexeclibdir=$toolexeclibdir/$multi_os_directory ;;
+-  esac
++  if test x"$enable_multi_os_directory" != x"no"; then
++    multi_os_directory=`$CC $CFLAGS -print-multi-os-directory`
++    case $multi_os_directory in
++      .) ;; # Avoid trailing /.
++      ../*) toolexeclibdir=$toolexeclibdir/$multi_os_directory ;;
++    esac
++  fi
+   AC_SUBST(toolexecdir)
+ else
+   toolexeclibdir="${libdir}"
+--- libffi-3.2.1-orig/configure	2014-11-12 11:59:57.000000000 +0000
++++ libffi-3.2.1/configure	2015-10-30 19:50:51.082221000 +0000
+@@ -886,6 +886,7 @@
+ enable_structs
+ enable_raw_api
+ enable_purify_safety
++enable_multi_os_directory
+ '
+       ac_precious_vars='build_alias
+ host_alias
+@@ -1538,6 +1539,8 @@
+   --disable-structs       omit code for struct support
+   --disable-raw-api       make the raw api unavailable
+   --enable-purify-safety  purify-safe mode
++  --disable-multi-os-directory
++                          disable use of gcc --print-multi-os-directory to change the library installation directory
+ 
+ Optional Packages:
+   --with-PACKAGE[=ARG]    use PACKAGE [ARG=yes]
+@@ -18714,6 +18717,12 @@
+ fi
+ 
+ 
++# Check whether --enable-multi-os-directory was given.
++if test "${enable_multi_os_directory+set}" = set; then :
++  enableval=$enable_multi_os_directory;
++fi
++
++
+ # These variables are only ever used when we cross-build to X86_WIN32.
+ # And we only support this with GCC, so...
+ if test "x$GCC" = "xyes"; then
+@@ -18725,11 +18734,13 @@
+     toolexecdir="${libdir}"/gcc-lib/'$(target_alias)'
+     toolexeclibdir="${libdir}"
+   fi
+-  multi_os_directory=`$CC $CFLAGS -print-multi-os-directory`
+-  case $multi_os_directory in
+-    .) ;; # Avoid trailing /.
+-    ../*) toolexeclibdir=$toolexeclibdir/$multi_os_directory ;;
+-  esac
++  if test x"$enable_multi_os_directory" != x"no"; then
++    multi_os_directory=`$CC $CFLAGS -print-multi-os-directory`
++    case $multi_os_directory in
++      .) ;; # Avoid trailing /.
++      ../*) toolexeclibdir=$toolexeclibdir/$multi_os_directory ;;
++    esac
++  fi
+ 
+ else
+   toolexeclibdir="${libdir}"