1bc74a22f8 test: show both Autotools and CMake usage for ctime_tests (8144225309)
Pull request description:
When building with CMake and running `ctime_tests` outside valgrind, users see:
```
Usage: libtool --mode=execute valgrind ./ctime_tests
```
CMake users don't have libtool. Show both commands.
### Before
```
$ ./build/bin/ctime_tests
This test can only usefully be run inside valgrind because it was not compiled under msan.
Usage: libtool --mode=execute valgrind ./ctime_tests
```
### After
```
$ ./build/bin/ctime_tests
This test can only usefully be run inside valgrind because it was not compiled under msan.
Usage: valgrind ./ctime_tests (or with Autotools: libtool --mode=execute valgrind ./ctime_tests)
```
Fixes#1697
ACKs for top commit:
real-or-random:
utACK 1bc74a22f8
Tree-SHA512: d35c332c75fe3df66928cb8b137e11995c67a57744985a50a539d1d9f24cf39ee46f17c6f6a501664a62f67e11b7bb041ba0e1eed6632bf7dccdb57a2c88f9bc
97de5120cf