FS-7605 Fix typo

debian/rules

@@ -73,6 +73,7 @@ override_dh_auto_clean:
 	./configure -C --enable-portable-binary --disable-dependency-tracking \
 		--host=$(DEB_HOST_GNU_TYPE) --build=$(DEB_BUILD_GNU_TYPE) \
 		--with-gnu-ld --with-python --with-erlang --with-openssl \
+		--sysconfdir=/etc \
 		--enable-core-odbc-support --enable-zrtp \
 		--enable-core-pgsql-support \
 		--prefix=/usr --localstatedir=/var \