zlib:
* Makefile.am: Make target library a convenience library.
* Makefile.in: Rebuilt.
libffi:
* Makefile.am: libfficonvenience -> libffi_convenience.
* Makefile.in: Rebuilt.
boehm-gc:
* Makefile.am: Make a convenience library.
* Makefile.in: Rebuilt.
libjava:
Build a single libgcj.so, without separate gc and zlib libraries.
* configure.in: Use convenience libraries for boehm-gc and zlib. Set
SYS_ZLIBS if system zlib is used.
* configure: Rebuilt.
* Makefile.am: Use boehm-gc and zlib convenience libraries.
* Makefile.in: Rebuilt.
* libtool-version: Increment .so version number.
From-SVN: r50900