THRIFT-5855: Add c_glib fuzzers

Add fuzzers for c_glib support, to improve the reliability/robustness of the implementation
diff --git a/lib/c_glib/test/Makefile.am b/lib/c_glib/test/Makefile.am
index 6eeece9..e61f875 100644
--- a/lib/c_glib/test/Makefile.am
+++ b/lib/c_glib/test/Makefile.am
@@ -18,7 +18,7 @@
 #
 AUTOMAKE_OPTIONS = subdir-objects serial-tests nostdinc
 
-SUBDIRS =
+SUBDIRS = fuzz
 
 BUILT_SOURCES = \
         gen-c_glib/t_test_container_test_types.c \