SWIG: Hack around SWIG segfault on private destructors

Apparently this problem has been fixed in SWIG 3.0.6. However,
until we can require that version, define "private" as "protected"
when running the SWIG parser.

Makefile.am

@@ -651,7 +651,8 @@ $(JCXX): $(srcdir)/$(JSWG) $(JDOC) bindings/swig/classes.i bindings/swig/enums.i
 		$(bindings_cxx_libsigrokcxx_la_include_HEADERS) \
 		$(nodist_bindings_cxx_libsigrokcxx_la_include_HEADERS)
 	-$(AM_V_at)rm -f $(java_cleanfiles)
-	$(AM_V_GEN)$(SWIG) -c++ -Dnoexcept= -java -package org.sigrok.core.classes \
+	$(AM_V_GEN)$(SWIG) -c++ -Dnoexcept= -Dprivate=protected \
+		-java -package org.sigrok.core.classes \
 		-Ibindings -I$(JCLS) $(local_includes) -I$(srcdir) $(JNI_CPPFLAGS) \
 		-outdir $(JCLS) -o $@ $(srcdir)/$(JSWG)
 

bindings/python/setup.py

@@ -87,8 +87,9 @@ setup(
     ext_modules = [
         Extension('sigrok.core._classes',
             sources = [vpath('sigrok/core/classes.i')],
-            swig_opts = ['-c++', '-threads', '-Dnoexcept=', '-Isigrok/core',
-                '-I..', '-I' + srcdir_parent] + ['-I%s' % i for i in includes],
+            swig_opts = ['-c++', '-threads', '-Dnoexcept=', '-Dprivate=protected',
+                '-Isigrok/core', '-I..', '-I' + srcdir_parent] +
+                ['-I%s' % i for i in includes],
             extra_compile_args = ['-Wno-uninitialized'],
             include_dirs = includes,
             library_dirs = libdirs,