glib2.0 2.25.8-1ubuntu1 FTBFS on armel: expected 'struct va_list *' but argument is of type 'va_list'

glib2.0 is failing to build on armel with the following error:

/bin/bash ../libtool --tag=CC --mode=compile gcc -DHAVE_CONFIG_H -I. -I/build/buildd/glib2.0-2.25.8/glib -I.. -I/build/buildd/glib2.0-2.25.8 -DG_LOG_DOMAIN=\"GLib\" -DG_ENABLE_DEBUG -DG_DISABLE_DEPRECATED -DGLIB_COMPILATION -DPCRE_STATIC -DG_DISABLE_SINGLE_INCLUDES -pthread -g -O2 -Wall -g -O2 -MT gvariant-parser.lo -MD -MP -MF .deps/gvariant-parser.Tpo -c -o gvariant-parser.lo /build/buildd/glib2.0-2.25.8/glib/gvariant-parser.c
libtool: compile: gcc -DHAVE_CONFIG_H -I. -I/build/buildd/glib2.0-2.25.8/glib -I.. -I/build/buildd/glib2.0-2.25.8 -DG_LOG_DOMAIN=\"GLib\" -DG_ENABLE_DEBUG -DG_DISABLE_DEPRECATED -DGLIB_COMPILATION -DPCRE_STATIC -DG_DISABLE_SINGLE_INCLUDES -pthread -g -O2 -Wall -g -O2 -MT gvariant-parser.lo -MD -MP -MF .deps/gvariant-parser.Tpo -c /build/buildd/glib2.0-2.25.8/glib/gvariant-parser.c -fPIC -DPIC -o .libs/gvariant-parser.o
/build/buildd/glib2.0-2.25.8/glib/gvariant-parser.c: In function 'IA__g_variant_builder_add_parsed':
/build/buildd/glib2.0-2.25.8/glib/gvariant-parser.c:2290: error: incompatible type for argument 2 of 'IA__g_variant_new_parsed_va'
/build/buildd/glib2.0-2.25.8/glib/gvariant-parser.c:2174: note: expected 'struct va_list *' but argument is of type 'va_list'
make[5]: *** [gvariant-parser.lo] Error 1

Full build log at <http://launchpadlibrarian.net/50019388/buildlog_ubuntu-maverick-armel.glib2.0_2.25.8-1ubuntu1_FAILEDTOBUILD.txt.gz>.

The line numbers are correct, though the function names are confusing due to some symbol aliases being defined in the included galiasdef.c.

Note that this is a cross-platform bug, it just winds up as a compiler warning on archs where va_list happens to be a pointer type instead of causing a build failure - but at runtime this function is going to fail consistently.