Mark installed shared library as executable.

Makefile

@@ -104,7 +104,7 @@ install: $(INSTALL_DEP)
 	cd src && test -f $(FILE_A) && $(INSTALL_F) $(FILE_A) $(INSTALL_STATIC) || :
 	$(RM) $(INSTALL_DYN) $(INSTALL_SHORT1) $(INSTALL_SHORT2)
 	cd src && test -f $(FILE_SO) && \
-	  $(INSTALL_F) $(FILE_SO) $(INSTALL_DYN) && \
+	  $(INSTALL_X) $(FILE_SO) $(INSTALL_DYN) && \
 	  $(LDCONFIG) $(INSTALL_LIB) && \
 	  $(SYMLINK) $(INSTALL_SONAME) $(INSTALL_SHORT1) && \
 	  $(SYMLINK) $(INSTALL_SONAME) $(INSTALL_SHORT2) || :