openssl should be added to buildrequires directly
to avoid below build error.
[ 10s] Run-time dependency GTest found: YES 1.8.1
[ 10s] Program openssl found: NO
[ 10s]
[ 10s] test/meson.build:6:0: ERROR: Program 'openssl' not found
Signed-off-by: Chenxi Mao <chenxi.mao@suse.com>