use cmake instead of ndk-build

loader/src/external/Android.mk

@@ -1,21 +0,0 @@
-LOCAL_PATH := $(call my-dir)
-
-# liblsplt.a
-include $(CLEAR_VARS)
-LOCAL_MODULE:= liblsplt
-LOCAL_C_INCLUDES := $(LOCAL_PATH)/lsplt/lsplt/src/main/jni/include
-LOCAL_EXPORT_C_INCLUDES := $(LOCAL_C_INCLUDES)
-LOCAL_CFLAGS := -Wall -Wextra -Werror -fvisibility=hidden -DLOG_DISABLED
-LOCAL_CPPFLAGS := -std=c++20
-LOCAL_STATIC_LIBRARIES := libcxx
-LOCAL_SRC_FILES := \
-    lsplt/lsplt/src/main/jni/elf_util.cc \
-    lsplt/lsplt/src/main/jni/lsplt.cc
-include $(BUILD_STATIC_LIBRARY)
-
-# Header only library
-include $(CLEAR_VARS)
-LOCAL_MODULE:= libphmap
-LOCAL_CFLAGS := -Wno-unused-value
-LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/parallel-hashmap
-include $(BUILD_STATIC_LIBRARY)

loader/src/external/CMakeLists.txt

@@ -0,0 +1,8 @@
+project(external)
+
+OPTION(LSPLT_BUILD_SHARED OFF)
+add_subdirectory(lsplt/lsplt/src/main/jni)
+
+add_library(phmap INTERFACE)
+target_include_directories(phmap INTERFACE parallel-hashmap)
+target_compile_options(phmap INTERFACE -Wno-unused-value)