Added BUILD_HOST_static to build statically linked executable/shared-lib

Statically linked executable/shared-lib (eg. SDK tools) are useful
in sandboxed environment.

In BUILD_HOST_static zipalign needs -lpthread indirectly:
zipalign->libutils.a->liblog.a->logd_write.c->pthread

Change-Id: I8fa91a937b728ccdf942c4ba199efb1e2e49da3d
diff --git a/core/combo/HOST_linux-x86.mk b/core/combo/HOST_linux-x86.mk
index a4da5ce..b369199 100644
--- a/core/combo/HOST_linux-x86.mk
+++ b/core/combo/HOST_linux-x86.mk
@@ -52,6 +52,11 @@
 HOST_GLOBAL_LDFLAGS += -m32
 endif # BUILD_HOST_64bit
 
+ifneq ($(strip $(BUILD_HOST_static)),)
+# Statically-linked binaries are desirable for sandboxed environment
+HOST_GLOBAL_LDFLAGS += -static
+endif # BUILD_HOST_static
+
 HOST_GLOBAL_CFLAGS += -fPIC
 HOST_GLOBAL_CFLAGS += \
 	-include $(call select-android-config-h,linux-x86)