Avoid Stack overflow' errors when running make check'

For explanation, see comments and text in the new file
libguile/measure-hwm.scm.

* .gitignore: Add libguile/stack-limit-calibration.scm.

* check-guile.in: Load libguile/stack-limit-calibration.scm.

* configure.in: Add AC_CONFIG_FILES to generate test-use-srfi from
  test-use-srfi.in.

* libguile/Makefile.am (TESTS, TESTS_ENVIRONMENT,
  stack-limit-calibration.scm): New targets, so that `make check'
  calibrates the stack limit before running the Guile test suite.

* libguile/measure-hwm.scm: New file, calibrates stack limit for `make
  check'.

* libguile/stackchk.c (scm_sys_get_stack_size): New primitive.

* libguile/stackchk.h (scm_sys_get_stack_size): New primitive
  (declaration).

* test-suite/standalone/test-use-srfi: Renamed test-use-srfi.in, so
  that ./configure can fill in variables in it.

* test-suite/standalone/test-use-srfi.in: Load
  libguile/stack-limit-calibration.scm.

check-guile.in

@@ -41,6 +41,7 @@ if [ ! -f guile-procedures.txt ] ; then
 fi
 
 exec $guile \
+    -l ${top_builddir}/libguile/stack-limit-calibration.scm \
     -e main -s "$TEST_SUITE_DIR/guile-test" \
     --test-suite "$TEST_SUITE_DIR/tests" \
     --log-file check-guile.log "$@"