Log Message:
Changes 0.5.7:
* Various build fixes, to make version info not say 0.5.5 any more.

Changes 0.5.6:
* Use libtool -export-symbols-regex instead of GNU ld script.
* Fix license with new FSF address.
* Test for socklen_t, needed for libgcrypt on some platforms.
* A few configure/build fixes.
* Don't use malloc.h.