broken libffi install on 3.3 branch and HEAD

[Matthias Klose]

/build/packages/gcc/snap/gcc-snapshot-20030128/src/libffi//build/packages/gcc/snap/gcc-snapshot-20030128/src/libffi/../mkinstalldirs: 
/build/packages/gcc/snap/gcc-snapshot-20030128/src/libffi//build/packages/gcc/snap/gcc-snapshot-20030128/src/libffi/../mkinstalldirs: No such file ordirectory
make[5]: *** [install-toolexeclibLTLIBRARIES] Error 127 
 
 
It looks like libffi/Makefile.in is wrongly built. On the 3.2 branch 
you have: 

mkinstalldirs = $(SHELL) $(top_srcdir)/../mkinstalldirs

On 3.3 and HEAD:

mkinstalldirs = $(SHELL) $(top_srcdir)/${libffi_basedir}/../mkinstalldirs

you introduced this in -r1.30

	Matthias