* configure.ac (USE_RNDOLDLINUX): Rename from USE_RNDLINUX.
(GCRYPT_RANDOM): Use rndoldlinux.lo.
* doc/gcrypt.texi: Update.
* random/Makefile.am (EXTRA_librandom_la_SOURCES): Update.
* random/rndoldlinux.c: Rename from rndlinux.c.  Rename the function.
* random/rand-internal.h: Update the function name.
* random/random-csprng.c: Update the calls to the function.
* random/random-drbg.c: Likewise.
* random/random-system.c: Likewise.
* src/global.c: Use USE_RNDOLDLINUX.