RFR(S): 8186438: 'configure' fails to find installed libfreetype on Ubuntu AArch64

[Dmitry Chuyko]

Please review the fix to let 'configure' proceed to success after 
dependencies installation on clean Ubuntu-aarch64.

bug: https://bugs.openjdk.java.net/browse/JDK-8186438
webrev: http://cr.openjdk.java.net/~dchuyko/8186438/webrev.00/

The fix changes known libfreetype.so location to reflect actual library 
path on Linux when 64-bit CPU is different from x86_64.
lib-freetype.m4 was changed and generated-configure.sh was regenerated.

--
Dmitry Chuyko