Support to build executables against the NDK

Use "LOCAL_SDK_VERSION := <number>" to build against the NDK when you
include $(BUILD_EXECUTABLE).

Bug: 7170098
Change-Id: I4cebeae3355e79a4d2f2f5549ef0613ced77e3f0
diff --git a/core/combo/TARGET_linux-x86.mk b/core/combo/TARGET_linux-x86.mk
index 96577f1..0e7c17d 100644
--- a/core/combo/TARGET_linux-x86.mk
+++ b/core/combo/TARGET_linux-x86.mk
@@ -191,16 +191,16 @@
 
 define transform-o-to-executable-inner
 $(hide) $(PRIVATE_CXX) \
-	$(TARGET_GLOBAL_LDFLAGS) \
+	$(PRIVATE_TARGET_GLOBAL_LDFLAGS) \
 	-nostdlib -Bdynamic \
 	-Wl,-dynamic-linker,/system/bin/linker \
 	-Wl,-z,nocopyreloc \
 	-fPIE -pie \
 	-o $@ \
-	$(TARGET_GLOBAL_LD_DIRS) \
+	$(PRIVATE_TARGET_GLOBAL_LD_DIRS) \
 	-Wl,-rpath-link=$(TARGET_OUT_INTERMEDIATE_LIBRARIES) \
 	$(call normalize-target-libraries,$(PRIVATE_ALL_SHARED_LIBRARIES)) \
-	$(if $(filter true,$(PRIVATE_NO_CRT)),,$(TARGET_CRTBEGIN_DYNAMIC_O)) \
+	$(if $(filter true,$(PRIVATE_NO_CRT)),,$(PRIVATE_TARGET_CRTBEGIN_DYNAMIC_O)) \
 	$(PRIVATE_ALL_OBJECTS) \
 	-Wl,--whole-archive \
 	$(call normalize-target-libraries,$(PRIVATE_ALL_WHOLE_STATIC_LIBRARIES)) \
@@ -209,17 +209,17 @@
 	$(call normalize-target-libraries,$(PRIVATE_ALL_STATIC_LIBRARIES)) \
 	$(if $(PRIVATE_GROUP_STATIC_LIBRARIES),-Wl$(comma)--end-group) \
 	$(PRIVATE_LDFLAGS) \
-	$(TARGET_LIBGCC) \
-	$(if $(filter true,$(PRIVATE_NO_CRT)),,$(TARGET_CRTEND_O))
+	$(PRIVATE_TARGET_LIBGCC) \
+	$(if $(filter true,$(PRIVATE_NO_CRT)),,$(PRIVATE_TARGET_CRTEND_O))
 endef
 
 define transform-o-to-static-executable-inner
 $(hide) $(PRIVATE_CXX) \
-	$(TARGET_GLOBAL_LDFLAGS) \
+	$(PRIVATE_TARGET_GLOBAL_LDFLAGS) \
 	-nostdlib -Bstatic \
 	-o $@ \
-	$(TARGET_GLOBAL_LD_DIRS) \
-	$(if $(filter true,$(PRIVATE_NO_CRT)),,$(TARGET_CRTBEGIN_STATIC_O)) \
+	$(PRIVATE_TARGET_GLOBAL_LD_DIRS) \
+	$(if $(filter true,$(PRIVATE_NO_CRT)),,$(PRIVATE_TARGET_CRTBEGIN_STATIC_O)) \
 	$(PRIVATE_LDFLAGS) \
 	$(PRIVATE_ALL_OBJECTS) \
 	-Wl,--whole-archive \
@@ -227,9 +227,9 @@
 	-Wl,--no-whole-archive \
 	-Wl,--start-group \
 	$(call normalize-target-libraries,$(PRIVATE_ALL_STATIC_LIBRARIES)) \
-	$(TARGET_LIBGCC) \
+	$(PRIVATE_TARGET_LIBGCC) \
 	-Wl,--end-group \
-	$(if $(filter true,$(PRIVATE_NO_CRT)),,$(TARGET_CRTEND_O))
+	$(if $(filter true,$(PRIVATE_NO_CRT)),,$(PRIVATE_TARGET_CRTEND_O))
 endef
 
 # Special check for x86 NDK ABI compatibility.