tests: Remove remnants of 'check-local'.
* tests/gpgsm/Makefile.am (check-local): Drop rule and the dependency on it.
Previously, the test environment was created during 'make check'.
Nowadays we create it using 'BUILT_SOURCES' during 'make all'. Drop
remnant of the previous method.
- Signed-off-by: Justus Winter <justus@g10code.com>