Update cross prefix following recent dockcross updates (#655)

* simplify the cross prefix, as the binaries are available in the PATH

* update cross prefix for Linux arm64, following recent dockcross changes

see:  /~https://github.com/dockcross/dockcross/pull/547/files#diff-c54899d03cb7216b8fd1f26f7d3596963d167b8954f83c9c26f33d9d4b84470aR19

* update strip for Linux Android arm, following recent dockcross changes

see: dockcross/dockcross#570 and dockcross/dockcross#568

Makefile

@@ -154,16 +154,16 @@ alpine-linux64: $(SQLITE_UNPACKED) jni-header
 	docker run $(DOCKER_RUN_OPTS) -v $$PWD:/work xerial/alpine-linux-x86_64 bash -c 'make clean-native native OS_NAME=Linux-Alpine OS_ARCH=x86_64'
 
 linux-arm: $(SQLITE_UNPACKED) jni-header
-	./docker/dockcross-armv5 -a $(DOCKER_RUN_OPTS) bash -c 'make clean-native native CROSS_PREFIX=/usr/xcc/armv5-unknown-linux-gnueabi/bin/armv5-unknown-linux-gnueabi- OS_NAME=Linux OS_ARCH=arm'
+	./docker/dockcross-armv5 -a $(DOCKER_RUN_OPTS) bash -c 'make clean-native native CROSS_PREFIX=armv5-unknown-linux-gnueabi- OS_NAME=Linux OS_ARCH=arm'
 
 linux-armv6: $(SQLITE_UNPACKED) jni-header
-	./docker/dockcross-armv6 -a $(DOCKER_RUN_OPTS) bash -c 'make clean-native native CROSS_PREFIX=/usr/xcc/armv6-unknown-linux-gnueabihf/bin/armv6-unknown-linux-gnueabihf- OS_NAME=Linux OS_ARCH=armv6'
+	./docker/dockcross-armv6 -a $(DOCKER_RUN_OPTS) bash -c 'make clean-native native CROSS_PREFIX=armv6-unknown-linux-gnueabihf- OS_NAME=Linux OS_ARCH=armv6'
 
 linux-armv7: $(SQLITE_UNPACKED) jni-header
-	./docker/dockcross-armv7a -a $(DOCKER_RUN_OPTS) bash -c 'make clean-native native CROSS_PREFIX=/usr/xcc/arm-cortexa8_neon-linux-gnueabihf/bin/arm-cortexa8_neon-linux-gnueabihf- OS_NAME=Linux OS_ARCH=armv7'
+	./docker/dockcross-armv7a -a $(DOCKER_RUN_OPTS) bash -c 'make clean-native native CROSS_PREFIX=arm-cortexa8_neon-linux-gnueabihf- OS_NAME=Linux OS_ARCH=armv7'
 
 linux-arm64: $(SQLITE_UNPACKED) jni-header
-	./docker/dockcross-arm64 -a $(DOCKER_RUN_OPTS) bash -c 'make clean-native native CROSS_PREFIX=/usr/xcc/aarch64-unknown-linux-gnueabi/bin/aarch64-unknown-linux-gnueabi- OS_NAME=Linux OS_ARCH=aarch64'
+	./docker/dockcross-arm64 -a $(DOCKER_RUN_OPTS) bash -c 'make clean-native native CROSS_PREFIX=aarch64-unknown-linux-gnu- OS_NAME=Linux OS_ARCH=aarch64'
 
 linux-android-arm: $(SQLITE_UNPACKED) jni-header
 	./docker/dockcross-android-arm -a $(DOCKER_RUN_OPTS) bash -c 'make clean-native native CROSS_PREFIX=/usr/arm-linux-androideabi/bin/arm-linux-androideabi- OS_NAME=Linux OS_ARCH=android-arm'

Makefile.common

@@ -100,7 +100,7 @@ Linux-armv7_LIBNAME   := libsqlitejdbc.so
 Linux-armv7_SQLITE_FLAGS  :=
 
 Linux-android-arm_CC        := $(CROSS_PREFIX)gcc
-Linux-android-arm_STRIP     := $(CROSS_PREFIX)strip
+Linux-android-arm_STRIP     := /usr/arm-linux-androideabi/bin/llvm-strip
 Linux-android-arm_CCFLAGS   := -I$(JAVA_HOME)/include -Ilib/inc_linux -I/usr/arm-linux-androideabi/sysroot/usr/include -Os -fPIC -fvisibility=hidden -fPIE -pie -lm -lc -landroid -ldl -llog
 Linux-android-arm_LINKFLAGS := -shared -static-libgcc
 Linux-android-arm_LIBNAME   := libsqlitejdbc.so