Remove unused signatures

Author: mattjala

tools/test/h5diff/h5diffgentest.c

@@ -182,8 +182,6 @@ static void test_data_nocomparables(const char *fname, int diff);
 static void test_objs_nocomparables(const char *fname1, const char *fname2);
 static void test_objs_strings(const char *fname, const char *fname2);
 static void test_double_epsilon(const char *fname1, const char *fname2);
-static void gent_trefer_attr(void);
-static void gent_vlstr(const char *filename);
 
 /* Generate the files for testing Onion VFD */
 static int test_onion_1d_dset(const char *fname);