Don't build rtest by default

rtest is the only binary that is built for the host and has additional
dependencies: mpfr and mpc.  To avoid build issues only build it if
the randomized tests are run.  New build target is introduced for
randomized testing, so make check works without rtest.

Tests are no longer copied to the build directory and the runtest.sh
tool is removed as it is not very useful.
2 files changed
tree: b0d8e53efc55ff8c67d37cc4bc4237577642c1f0
  1. auxiliary/
  2. math/
  3. test/
  4. .gitignore
  5. config.mk.dist
  6. LICENSE
  7. Makefile
  8. README