Fix dlopening of plugins

Finit must export symbols, but plugins do not since they are modules.

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

Makefile.am

@@ -23,6 +23,7 @@ AM_CPPFLAGS        = -U_FORTIFY_SOURCE
 AM_CPPFLAGS       += -D_XOPEN_SOURCE=600 -D_BSD_SOURCE -D_GNU_SOURCE -D_DEFAULT_SOURCE
 AM_CPPFLAGS       += -DFINIT_CONF=\"$(conf)\" -DFINIT_RCSD=\"$(rcsd)\" -DFINIT_FIFO=\"$(fifo)\" \
 		     -DPLUGIN_PATH=\"$(pkglibdir)\"
+AM_LDFLAGS         = -export-dynamic
 
 # Slightly ugly hacks to prevent the build system from installing
 # libuev/libite, which it does if we use the more plain SUBDIRS.