Don't build or install test libraries with make and make install.

Using make check builds but does not install them.

Makefile.am

 noinst_bin_PROGRAMS =
 noinst_bindir =
 
-noinst_lib_LTLIBRARIES =
+check_LTLIBRARIES =
 noinst_libdir =
 
 ##### ChangeLog:
 # Test version of libespeak-ng.so with access to the internal APIs, so they can
 # be accessed in the test code. This version should not be installed, as the
 # internal APIs are not guaranteed to be stable between releases.
-lib_LTLIBRARIES += src/libespeak-ng-test.la
+check_LTLIBRARIES += src/libespeak-ng-test.la
 
 src_libespeak_ng_test_la_LDFLAGS = $(src_libespeak_ng_la_LDFLAGS)
 src_libespeak_ng_test_la_CFLAGS  = \
 if !HAVE_LIBFUZZER
 # libfuzzrunner is a stub implementation of libFuzzer that calls the
 # LLVMFuzzerTestOneInput with the files passed to the fuzzer program.
-lib_LTLIBRARIES += tests/libfuzzrunner.la
+check_LTLIBRARIES += tests/libfuzzrunner.la
 tests_libfuzzrunner_la_CFLAGS  = -Isrc/libespeak-ng ${AM_CFLAGS}
 tests_libfuzzrunner_la_SOURCES = tests/fuzzrunner.c
 endif