reftable: drop obsolete test function declarations

These functions were moved to the unit test framework in ba9661b (t:
move reftable/record_test.c to the unit testing framework, 2024-07-02)
and b34116a (t: move reftable/basics_test.c to the unit testing
framework, 2024-05-29). The declarations in reftable-tests.h are
leftover cruft.

Signed-off-by: Jeff King <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: peff

reftable/reftable-tests.h

@@ -9,9 +9,7 @@ license that can be found in the LICENSE file or at
 #ifndef REFTABLE_TESTS_H
 #define REFTABLE_TESTS_H
 
-int basics_test_main(int argc, const char **argv);
 int block_test_main(int argc, const char **argv);
-int record_test_main(int argc, const char **argv);
 int readwrite_test_main(int argc, const char **argv);
 int stack_test_main(int argc, const char **argv);
 int reftable_dump_main(int argc, char *const *argv);