Remove duplicated definition

Signed-off-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

Makefile.target

diff --git a/Makefile.target b/Makefile.target
index a4cb506..ca11c75 100644
--- a/Makefile.target
+++ b/Makefile.target
@@ -687,8 +687,6 @@
 CPPFLAGS+=-I$(SRC_PATH)/slirp
 endif
 
-LIBS+=$(PTHREADLIBS)
-LIBS+=$(CLOCKLIBS)
 # specific flags are needed for non soft mmu emulator
 ifdef CONFIG_STATIC
 LDFLAGS+=-static