fix(workflow): add CFLAGS for CURL Android builds and clean up Android build files

Author: Gioee

Makefile

@@ -107,7 +107,7 @@ else ifeq ($(PLATFORM),android)
 
 	OPENSSL := $(BIN)/../sysroot/usr/include/openssl
 	CC = $(BIN)/$(ARCH)-linux-$(ANDROID_ABI)-clang
-	CURL_CONFIG = --host $(ARCH)-linux-$(ANDROID_ABI) --with-openssl=$(BIN)/../sysroot/usr LIBS="-lssl -lcrypto" AR=$(BIN)/llvm-ar AS=$(BIN)/llvm-as CC=$(CC) CXX=$(BIN)/$(ARCH)-linux-$(ANDROID_ABI)-clang++ LD=$(BIN)/ld RANLIB=$(BIN)/llvm-ranlib STRIP=$(BIN)/llvm-strip
+	CURL_CONFIG = --host $(ARCH)-linux-$(ANDROID_ABI) --with-openssl=$(BIN)/../sysroot/usr LIBS="-lssl -lcrypto" AR=$(BIN)/llvm-ar AS=$(BIN)/llvm-as CC=$(CC) CXX=$(BIN)/$(ARCH)-linux-$(ANDROID_ABI)-clang++ LD=$(BIN)/ld RANLIB=$(BIN)/llvm-ranlib STRIP=$(BIN)/llvm-strip CFLAGS="-fPIC"
 	TARGET := $(DIST_DIR)/cloudsync.so
 	LDFLAGS += -shared -lcrypto -lssl
 	STRIP = $(BIN)/llvm-strip --strip-unneeded $@
@@ -378,6 +378,10 @@ aar:
 	cd packages/android && ./gradlew clean assembleRelease
 	cp packages/android/build/outputs/aar/android-release.aar $(DIST_DIR)/cloudsync.aar
 
+clean-aar:
+	rm -rf packages/android/build $(AAR_ARM64) $(AAR_ARM) $(AAR_X86)
+	$(AAR_CLEAN)
+
 # Tools
 version:
 	@echo $(shell sed -n 's/^#define CLOUDSYNC_VERSION[[:space:]]*"\([^"]*\)".*/\1/p' src/cloudsync.h)