lib/pkcs11h-core.c: fix build without slotevent

[ffontaine]

Fix the following build failure with --disable-slotevent:

/home/giuliobenetti/autobuild/run/instance-0/output-1/host/opt/ext-toolchain/bin/../lib/gcc/arm-buildroot-linux-uclibcgnueabihf/9.3.0/../../../../arm-buildroot-linux-uclibcgnueabihf/bin/ld: /home/giuliobenetti/autobuild/run/instance-0/output-1/host/arm-buildroot-linux-uclibcgnueabihf/sysroot/usr/lib/libpkcs11-helper.so: undefined reference to `_pkcs11h_slotevent_init'

Fixes:

• http://autobuild.buildroot.org/results/fcaa70cc035d6f9d35dfa8d564e9948c7e1cfd9e

Signed-off-by: Fabrice Fontaine fontaine.fabrice@gmail.com

[alonbl]

Thanks!