openprs-agent: build OpenPRS modules without SOVER

Setting the SO version is not necessary for the modules and creating the
symlinks is confusing, rather than helping. Additionally, that leads to
wrong provides and includes during RPM generation.

Therefore, exempt OpenPRS modules from SOVER setting.

src/plugins/openprs-agent/Makefile

@@ -37,6 +37,9 @@ OBJS_all = $(OBJS_openprs_agent) $(OBJS_openprs_mod_skiller) \
 INST_LIB_SUBDIR_openprs_mod_skiller  = $(FFLIBSUBDIR)
 INST_LIB_SUBDIR_openprs_mod_protobuf = $(FFLIBSUBDIR)
 INST_LIB_SUBDIR_openprs_mod_navgraph = $(FFLIBSUBDIR)
+NOSOVER_openprs_mod_skiller  = 1
+NOSOVER_openprs_mod_protobuf = 1
+NOSOVER_openprs_mod_navgraph = 1
 
 # Extra files for system-wide install, i.e., "make install"
 FILES_openprs_files   = $(subst $(SRCDIR)/,,$(wildcard $(addprefix $(SRCDIR)/data/,*.opf *.inc *.sym)))