Fix POSIX install with missing or incompatible ldconfig.

Makefile

@@ -74,7 +74,7 @@ SYMLINK= ln -sf
 INSTALL_X= install -m 0755
 INSTALL_F= install -m 0644
 UNINSTALL= $(RM)
-LDCONFIG= ldconfig -n
+LDCONFIG= ldconfig -n 2>/dev/null
 SED_PC= sed -e "s|^prefix=.*|prefix=$(PREFIX)|" \
             -e "s|^multilib=.*|multilib=$(MULTILIB)|"
 
@@ -118,7 +118,7 @@ install: $(INSTALL_DEP)
 	$(RM) $(INSTALL_TSYM) $(INSTALL_DYN) $(INSTALL_SHORT1) $(INSTALL_SHORT2)
 	cd src && test -f $(FILE_SO) && \
 	  $(INSTALL_X) $(FILE_SO) $(INSTALL_DYN) && \
-	  $(LDCONFIG) $(INSTALL_LIB) && \
+	  ( $(LDCONFIG) $(INSTALL_LIB) || : ) && \
 	  $(SYMLINK) $(INSTALL_SONAME) $(INSTALL_SHORT1) && \
 	  $(SYMLINK) $(INSTALL_SONAME) $(INSTALL_SHORT2) || :
 	cd etc && $(INSTALL_F) $(FILE_MAN) $(INSTALL_MAN)