[Fontconfig] install problem with --disable-shared

[Mark Brand]

There's a minor problem when fontconfig is built with --disable-shared 
for MinGW. The install attempts to install the DLL anyway:

libtool: install: i686-pc-mingw32-ranlib 
<snip>/mxe/usr/i686-pc-mingw32/lib/libfontconfig.a
/usr/bin/install -c .libs/libfontconfig.dll.a 
<snip>/mxe/usr/i686-pc-mingw32/lib
/usr/bin/install: cannot stat ‘.libs/libfontconfig.dll.a’: No such file 
or directory
make[5]: *** [install-libtool-import-lib] Error 1

The workaround is to remove "install-data-local:.*,install-data-local:" 
from Makefile.in, but maybe this would not be too hard to fix before 
version 3.

By the way, this problem predates 2.9.91.

Mark