libffi: fix include path

libffi/.footprint

@@ -1,9 +1,8 @@
 drwxr-xr-x	root/root	usr/
+drwxr-xr-x	root/root	usr/include/
+-rw-r--r--	root/root	usr/include/ffi.h
+-rw-r--r--	root/root	usr/include/ffitarget.h
 drwxr-xr-x	root/root	usr/lib/
-drwxr-xr-x	root/root	usr/lib/libffi-3.2.1/
-drwxr-xr-x	root/root	usr/lib/libffi-3.2.1/include/
--rw-r--r--	root/root	usr/lib/libffi-3.2.1/include/ffi.h
--rw-r--r--	root/root	usr/lib/libffi-3.2.1/include/ffitarget.h
 -rw-r--r--	root/root	usr/lib/libffi.a
 -rwxr-xr-x	root/root	usr/lib/libffi.la
 lrwxrwxrwx	root/root	usr/lib/libffi.so -> libffi.so.6.0.4

libffi/.signature

@@ -1,5 +1,5 @@
 untrusted comment: verify with /etc/ports/opt.pub
-RWSE3ohX2g5d/XqIC63xPKQQLncJtTmd97sfeUPO8sNPfeIS7ZzuopG6JXiKVdeWU+ZzpElcS2k7uc+9LVOg2IfpUxE1iCyw3gY=
-SHA256 (Pkgfile) = c1936e02df97e33210053c8c3bb4ad57361fb26c83848d1b8b8e0d255401fc03
-SHA256 (.footprint) = 15bc1dc1c3384888271bcd1ebaec513546636d58ef3a9f1e02937b3b76846cf9
+RWSE3ohX2g5d/bE7OoYUXZ8x+3WT2/zcydZdbZ8uj8B02pXh316w7W481AFTRjZV0FqHWi2DVnE5H872GKJ2jE1PJE0GeGCxfw0=
+SHA256 (Pkgfile) = 9de7852685f1ea07111476eea9028699a63859af295e25f74b283ae62bd91261
+SHA256 (.footprint) = edc15544aefa5bb35ff787274decd783a341fb24ed77e2b34ba0833cd9e6f335
 SHA256 (libffi-3.2.1.tar.gz) = d06ebb8e1d9a22d19e38d63fdb83954253f39bedc5d46232a05645685722ca37

libffi/Pkgfile

@@ -4,11 +4,20 @@
 
 name=libffi
 version=3.2.1
-release=2
-source=(ftp://sourceware.org/pub/libffi/$name-$version.tar.gz)
+release=3
+source=(https://sourceware.org/pub/$name/$name-$version.tar.gz)
 
 build() {
     cd $name-$version
+
+    sed -e '/^includesdir/ s/$(libdir).*$/$(includedir)/' \
+        -i include/Makefile.in
+
+    sed \
+        -e '/^includedir/ s/=.*$/=@includedir@/' \
+        -e 's/^Cflags: -I${includedir}/Cflags:/' \
+        -i libffi.pc.in
+
     ./configure --prefix=/usr
     make
     make DESTDIR=$PKG install