libext4_utils.mk: modifications to make it build in yocto environment

Adding an include file that is setting the common flags.
Changed the cppflag to include the headers from other components
of android-tools

Modified LDflags so that the libraries that are coming from other android-tools
are searched in the output folder.

Modified the build rule so that it outputs the binary and header to the OUT_DIR

Signed-off-by: Nisha Parrakat <Nisha.Parrakat@kpit.com>

--- git/system/extras/debian/libext4_utils.mk	2021-04-29 21:46:39.384394114 +0000
+++ git/system/extras/debian/libext4_utils.mk	2021-04-29 21:49:53.808605543 +0000
@@ -1,3 +1,4 @@
+include ../../rules_yocto.mk
 NAME = libext4_utils
 
 ext4_utils_SOURCES := \
@@ -17,14 +18,16 @@
             -Iext4_utils/include \
             -Ilibfec/include \
             -Isquashfs_utils \
-            -I/usr/include/android \
+            -I/usr/include/android -I$(OUT_DIR)/usr/include \
             -D_GNU_SOURCE -DFEC_NO_KLOG -DSQUASHFS_NO_KLOG -D_LARGEFILE64_SOURCE
 LDFLAGS += -shared -Wl,-soname,$(NAME).so.0 \
            -Wl,-rpath=/usr/lib/$(DEB_HOST_MULTIARCH)/android \
-           -L/usr/lib/$(DEB_HOST_MULTIARCH)/android \
+           -L$(OUT_DIR)/usr/lib/$(DEB_HOST_MULTIARCH)/android/ \
            -lbase -lsparse -lselinux
 
 build: $(SOURCES)
-	mkdir --parents $(OUT_DIR)
-	$(CC) $^ -o $(OUT_DIR)/$(NAME).so.0 $(CFLAGS) $(CPPFLAGS) $(LDFLAGS)
-	ln -s $(NAME).so.0 $(OUT_DIR)/$(NAME).so
+	mkdir --parents $(OUT_DIR)/usr/lib/$(DEB_HOST_MULTIARCH)/android/	
+	$(CC) $^ -o $(OUT_DIR)/usr/lib/$(DEB_HOST_MULTIARCH)/android/$(NAME).so.0 $(CFLAGS) $(CPPFLAGS) $(LDFLAGS)
+	ln -s $(NAME).so.0 $(OUT_DIR)/usr/lib/$(DEB_HOST_MULTIARCH)/android/$(NAME).so
+	cp -r ext4_utils/include/* $(OUT_DIR)/usr/include/
+