For upstream: fix passing --export-dynamic to the linker. -rdynamic is
implemented by at least gcc and clang.  Using -export-dynamic with gcc
only worked because of an implementation quirk that was since acknowledged.

Index: src/Makefile.am
--- src/Makefile.am.orig
+++ src/Makefile.am
@@ -24,5 +24,6 @@ AM_CPPFLAGS = @PACKAGE_CFLAGS@ \
 	-DPACKAGE_DATA_DIR=\""$(datadir)"\" \
 	-DPACKAGE_LOCALE_DIR=\""$(prefix)/$(DATADIRNAME)/locale"\"
 
-AM_CFLAGS = -export-dynamic -Wall
+AM_CFLAGS = -Wall
+AM_LDFLAGS = -rdynamic