Reverting eba28948a5 which was only necessary when cross-compiling the plugins for Android 2.0.

With the coming monolithic build using Android.mk files this won't be
necessary anymore.

src/libstrongswan/plugins/gmp/Makefile.am

@@ -5,10 +5,8 @@ AM_CFLAGS = -rdynamic
 
 if MONOLITHIC
 noinst_LTLIBRARIES = libstrongswan-gmp.la
-libstrongswan_gmp_la_LIBADD =
 else
 plugin_LTLIBRARIES = libstrongswan-gmp.la
-libstrongswan_gmp_la_LIBADD = $(top_builddir)/src/libstrongswan/libstrongswan.la
 endif
 
 libstrongswan_gmp_la_SOURCES = \
@@ -18,4 +16,4 @@ libstrongswan_gmp_la_SOURCES = \
 	gmp_rsa_public_key.c gmp_rsa_public_key.h
 
 libstrongswan_gmp_la_LDFLAGS = -module -avoid-version
-libstrongswan_gmp_la_LIBADD += -lgmp
+libstrongswan_gmp_la_LIBADD  = -lgmp