THRIFT-940 use BOOST_LDFLAGS for unit tests, required to build on Mac OS X

Patch: Christian Lavoie


git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@1004431 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/lib/cpp/test/Makefile.am b/lib/cpp/test/Makefile.am
index 0585250..c478cce 100644
--- a/lib/cpp/test/Makefile.am
+++ b/lib/cpp/test/Makefile.am
@@ -58,7 +58,7 @@
 	TMemoryBufferTest.cpp \
 	TBufferBaseTest.cpp
 
-UnitTests_LDADD = libtestgencpp.la -lboost_unit_test_framework
+UnitTests_LDADD = $(BOOST_LDFLAGS) libtestgencpp.la -lboost_unit_test_framework
 
 #
 # TFDTransportTest