FS-11487 convert tests to Makefile.am

Makefile.am

 EXTRA_DIST =
-SUBDIRS = . src build
+SUBDIRS = . src build tests/unit
 AUTOMAKE_OPTIONS = foreign subdir-objects
 NAME = freeswitch
 
@@ -865,16 +865,3 @@ support:
 	@cp support-d/.bashrc ~
 	@test -f ~/.cc-mode-installed || sh support-d/install-cc-mode.sh && touch ~/.cc-mode-installed
 
-# Using a non-recursive Makefile structure for the automated tests so that the tests have visibility into
-# targets in the rest of the FreeSWITCH tree. This greatly simplifies dependency tracking at the expense
-# of longer test target names. Since the tests are expected to be run easily and rapidly after minor source
-# changes this is the most effective structure.
-
-check_PROGRAMS =
-
-include tests/unit/unit.mk
-
-TESTS = $(check_PROGRAMS)
-
-tests: $(check_PROGRAMS)
-