* build-aux/configure-lib.sh (libtcc1_SOURCES)[arm]: Add div.c, __memcpy, __memmove, __memset. * build-aux/build-source-lib.sh: Generate libtcc1.
* build-aux/build-lib.sh: Remove building of source lib. * build-aux/build-source-lib.sh: New file. * build-aux/build.sh.in: Invoke it. * build-aux/bootstrap.sh.in: Likewise.