Makefile-libostree.am: Uncomment BUILDOPT_IS_DEVEL_BUILD conditional

We shouldn't have to toggle the conditional itself during release
builds. It should only evaluate to true during devel builds.

Makefile-libostree.am

@@ -182,9 +182,9 @@ libostree_1_la_SOURCES += \
 endif # USE_GPGME
 
 symbol_files = $(top_srcdir)/src/libostree/libostree-released.sym
-#if BUILDOPT_IS_DEVEL_BUILD
+if BUILDOPT_IS_DEVEL_BUILD
 symbol_files += $(top_srcdir)/src/libostree/libostree-devel.sym
-#endif
+endif
 # http://blog.jgc.org/2007/06/escaping-comma-and-space-in-gnu-make.html
 wl_versionscript_arg = -Wl,--version-script=
 EXTRA_DIST += \