Add -shared to clang LDFLAGS.

TOT clang doesn't do the right thing with regards to -pie without this.

Change-Id: Ic14cfb25d96359eb18899c09ebaf1d311e937d01
diff --git a/core/combo/TARGET_linux-arm.mk b/core/combo/TARGET_linux-arm.mk
index 52ddbec..eb0a9f8 100644
--- a/core/combo/TARGET_linux-arm.mk
+++ b/core/combo/TARGET_linux-arm.mk
@@ -225,6 +225,7 @@
 	-nostdlib -Wl,-soname,$(notdir $@) \
 	-Wl,--gc-sections \
 	-Wl,-shared,-Bsymbolic \
+	-shared \
 	$(PRIVATE_TARGET_GLOBAL_LD_DIRS) \
 	$(if $(filter true,$(PRIVATE_NO_CRT)),,$(PRIVATE_TARGET_CRTBEGIN_SO_O)) \
 	$(PRIVATE_ALL_OBJECTS) \