do not include stlport headers unless link to it

Change-Id: I8344d270ddb601694b5fef0fa7b22ea437030728
diff --git a/Android.mk b/Android.mk
index 0598796..d54118b 100644
--- a/Android.mk
+++ b/Android.mk
@@ -100,7 +100,10 @@
     system/extras/ext4_utils \
     system/core/adb \
 
-LOCAL_C_INCLUDES += bionic external/stlport/stlport external/openssl/include $(LOCAL_PATH)/libmincrypt/includes
+LOCAL_C_INCLUDES += bionic external/openssl/include $(LOCAL_PATH)/libmincrypt/includes
+ifeq ($(shell test $(PLATFORM_SDK_VERSION) -lt 23; echo $$?),0)
+    LOCAL_C_INCLUDES += external/stlport/stlport
+endif
 
 LOCAL_STATIC_LIBRARIES :=
 LOCAL_SHARED_LIBRARIES :=
@@ -109,7 +112,7 @@
 LOCAL_SHARED_LIBRARIES += libz libc libcutils libstdc++ libtar libblkid libminuitwrp libminadbd libmtdutils libminzip libaosprecovery
 LOCAL_SHARED_LIBRARIES += libcrecovery
 
-ifeq (,$(filter $(PLATFORM_SDK_VERSION), 23))
+ifeq ($(shell test $(PLATFORM_SDK_VERSION) -lt 23; echo $$?),0)
     LOCAL_SHARED_LIBRARIES += libstlport
 else
     LOCAL_SHARED_LIBRARIES += libc++
diff --git a/gui/Android.mk b/gui/Android.mk
index 84f890c..40e0cd9 100644
--- a/gui/Android.mk
+++ b/gui/Android.mk
@@ -70,7 +70,11 @@
     LOCAL_CFLAGS += -DTW_ROUND_SCREEN
 endif
 
-LOCAL_C_INCLUDES += bionic external/stlport/stlport system/core/libpixelflinger/include
+LOCAL_C_INCLUDES += bionic system/core/libpixelflinger/include
+ifeq ($(shell test $(PLATFORM_SDK_VERSION) -lt 23; echo $$?),0)
+    LOCAL_C_INCLUDES += external/stlport/stlport
+endif
+
 LOCAL_CFLAGS += -DTWRES=\"$(TWRES_PATH)\"
 
 include $(BUILD_STATIC_LIBRARY)
diff --git a/mtp/Android.mk b/mtp/Android.mk
index 38d31ae..57f0ae3 100755
--- a/mtp/Android.mk
+++ b/mtp/Android.mk
@@ -7,7 +7,11 @@
 LOCAL_MODULE := libtwrpmtp
 LOCAL_MODULE_TAGS := optional
 LOCAL_CFLAGS = -D_FILE_OFFSET_BITS=64 -DMTP_DEVICE -DMTP_HOST -fno-strict-aliasing
-LOCAL_C_INCLUDES += $(LOCAL_PATH) bionic external/stlport/stlport frameworks/base/include system/core/include bionic/libc/private/
+LOCAL_C_INCLUDES += $(LOCAL_PATH) bionic frameworks/base/include system/core/include bionic/libc/private/
+ifeq ($(shell test $(PLATFORM_SDK_VERSION) -lt 23; echo $$?),0)
+    LOCAL_C_INCLUDES += external/stlport/stlport
+endif
+
 LOCAL_SRC_FILES = \
     btree.cpp \
     MtpDataPacket.cpp \
@@ -31,7 +35,7 @@
     node.cpp
 LOCAL_SHARED_LIBRARIES += libz libc libusbhost libstdc++ libdl libcutils libutils libaosprecovery
 
-ifeq (,$(filter $(PLATFORM_SDK_VERSION), 23))
+ifeq ($(shell test $(PLATFORM_SDK_VERSION) -lt 23; echo $$?),0)
     LOCAL_SHARED_LIBRARIES += libstlport
 else
     LOCAL_SHARED_LIBRARIES += libc++
diff --git a/twrpTarMain/Android.mk b/twrpTarMain/Android.mk
index 5f15bf0..5a1a443 100644
--- a/twrpTarMain/Android.mk
+++ b/twrpTarMain/Android.mk
@@ -11,8 +11,15 @@
 	../twrpDU.cpp
 LOCAL_CFLAGS:= -g -c -W -DBUILD_TWRPTAR_MAIN
 
-LOCAL_C_INCLUDES += bionic external/stlport/stlport
-LOCAL_STATIC_LIBRARIES := libc libtar_static libstlport_static libstdc++
+LOCAL_C_INCLUDES += bionic
+ifeq ($(shell test $(PLATFORM_SDK_VERSION) -lt 23; echo $$?),0)
+    LOCAL_C_INCLUDES += external/stlport/stlport
+endif
+
+LOCAL_STATIC_LIBRARIES := libc libtar_static libstdc++
+ifeq ($(shell test $(PLATFORM_SDK_VERSION) -lt 23; echo $$?),0)
+    LOCAL_STATIC_LIBRARIES += libstlport_static
+endif
 
 ifeq ($(TWHAVE_SELINUX), true)
     LOCAL_C_INCLUDES += external/libselinux/include