Remove unused functions

These functions are reported as functions with no prototype by GCC
compiler. However, they're never called, so instead of fixing the
warning by creating a function prototype we can remove them.
/home/jcerny/openscap/src/OVAL/probes/unix/linux/rpmverify_probe.c: At top level:
/home/jcerny/openscap/src/OVAL/probes/unix/linux/rpmverify_probe.c:222:6: warning: no previous prototype for ‘rpmverify_probe_preload’ [-Wmissing-prototypes]
 void rpmverify_probe_preload()
      ^~~~~~~~~~~~~~~~~~~~~~~

/home/jcerny/openscap/src/OVAL/probes/unix/linux/rpmverifyfile_probe.c: At top level:
/home/jcerny/openscap/src/OVAL/probes/unix/linux/rpmverifyfile_probe.c:306:6: warning: no previous prototype for ‘rpmverifyfile_probe_preload’ [-Wmissing-prototypes]
 void rpmverifyfile_probe_preload()
      ^~~~~~~~~~~~~~~~~~~~~~~~~~~

Author: jan-cerny

src/OVAL/probes/unix/linux/rpmverify_probe.c

@@ -219,11 +219,6 @@ static int rpmverify_collect(probe_ctx *ctx,
         return (ret);
 }
 
-void rpmverify_probe_preload()
-{
-	rpmLibsPreload();
-}
-
 int rpmverify_probe_offline_mode_supported()
 {
 	// TODO: Switch this to OFFLINE_MODE_OWN once rpmtsSetRootDir is fully supported by librpm

src/OVAL/probes/unix/linux/rpmverifyfile_probe.c

@@ -303,11 +303,6 @@ static int rpmverify_collect(probe_ctx *ctx,
 	return (ret);
 }
 
-void rpmverifyfile_probe_preload()
-{
-	rpmLibsPreload();
-}
-
 int rpmverifyfile_probe_offline_mode_supported()
 {
 	// TODO: Switch this to OFFLINE_MODE_OWN once rpmtsSetRootDir is fully supported by librpm