move to new build system

cmake/libraries/secp256k1.cmake

@@ -0,0 +1,41 @@
+if(PROJECT_ENABLE_SECP256K1)
+  if(PROJECT_BUILD)
+    pkg_check_modules(SECP256K1 libsecp256k1=${SECP256K1_VERSION} REQUIRED)
+    add_definitions(-DPROJECT_ENABLE_SECP256K1)
+
+    include_directories(BEFORE SYSTEM
+      ${SECP256K1_INCLUDE_DIRS}
+    )
+
+    link_libraries(
+      ${SECP256K1_LINK_LIBRARIES}
+    )
+  elseif(NOT PROJECT_IS_MINGW OR CMAKE_HOST_WIN32)
+    if(PROJECT_BUILD_SHARED_LIBS)
+      set(SECP256K1_ENABLE_SHARED yes)
+    else()
+      set(SECP256K1_ENABLE_SHARED no)
+    endif()
+
+    ExternalProject_Add(secp256k1_project
+      PREFIX external
+      URL ${PROJECT_3RD_PARTY_DIR}/secp256k1-${SECP256K1_VERSION}.tar.gz
+      URL_HASH SHA256=61583939f1f25b92e6401e5b819e399da02562de663873df3056993b40148701
+      BUILD_IN_SOURCE 1
+      LIST_SEPARATOR |
+      CONFIGURE_COMMAND ./autogen.sh && ./configure
+        --enable-shared=${SECP256K1_ENABLE_SHARED}
+        --enable-static=yes
+        --enable-module-ecdh
+        --enable-module-recovery
+        --prefix=${PROJECT_EXTERNAL_BUILD_ROOT}
+      BUILD_COMMAND make -j1
+      INSTALL_COMMAND make install
+    )
+
+    set(PROJECT_DEPENDENCIES 
+      ${PROJECT_DEPENDENCIES}
+      secp256k1_project
+    )
+  endif()
+endif()