lib/Makefile.inc: Remove effect-free line

Because of a typo, `bootblcok-y += rtc.c` does nothing. Drop it.

Change-Id: Ife2ee152ab32ef23df5986c47bec490db592ab60
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/56216
Reviewed-by: Paul Menzel <paulepanter@mailbox.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Werner Zeh <werner.zeh@siemens.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/lib/Makefile.inc

@@ -61,7 +61,6 @@ bootblock-y += memchr.c
 bootblock-y += memcmp.c
 bootblock-y += boot_device.c
 bootblock-y += fmap.c
-bootblcok-y += rtc.c
 
 verstage-y += prog_loaders.c
 verstage-y += prog_ops.c