Replace deprecated CMake FetchContent_Populate calls

In RapidJSON's case, we still call FetchContent_Populate because we only
need the headers, but we do it in a non-deprecated way. Unfortunately,
GIT_SUBMODULES is no longer respected, so gtest is fetched
unnecessarily. This may be a CMake bug.

Signed-off-by: James Le Cuirot <jlecuirot@microsoft.com>

Author: chewi

CMake/FindCURL.cmake

@@ -14,9 +14,7 @@ if(${BUILD_CURL_FROM_SOURCE})
     # In libcurl, CMakeLists build static lib is broken add build command via
     # make
     if(NOT TARGET libcurl_static_build)
-        if (NOT curl_bundle_POPULATED)
-            FetchContent_Populate(curl_bundle)
-        endif()
+        FetchContent_MakeAvailable(curl_bundle)
         find_package(OpenSSL)
         add_custom_command(
             OUTPUT ${curl_bundle_BINARY_DIR}/lib/libcurl.a

CMake/FindOpenSSL.cmake

@@ -14,9 +14,7 @@ if(${BUILD_CURL_FROM_SOURCE})
     FetchContent_GetProperties(openssl102)
 
     if(NOT TARGET openssl102_static_build)
-        if(NOT openssl102_POPULATED)
-            FetchContent_Populate(openssl102)
-        endif()
+        FetchContent_MakeAvailable(openssl102)
         add_custom_command(
             OUTPUT ${openssl102_BINARY_DIR}/lib/libssl.a
             WORKING_DIRECTORY ${openssl102_SOURCE_DIR}

CMake/Finde2fs.cmake

@@ -9,9 +9,7 @@ if(NOT ORIGIN_EXT2FS)
     FetchContent_GetProperties(e2fsprogs)
 
     if(NOT TARGET libext2fs_build)
-        if (NOT e2fsprogs_POPULATED)
-            FetchContent_Populate(e2fsprogs)
-        endif()
+        FetchContent_MakeAvailable(e2fsprogs)
         set(LIBEXT2FS_INSTALL_DIR ${e2fsprogs_SOURCE_DIR}/build/libext2fs CACHE STRING "")
 
         add_custom_command(

CMake/Findrapidjson.cmake

@@ -1,12 +1,11 @@
-FetchContent_Declare(
-  rapidjson
-  GIT_REPOSITORY https://github.com/Tencent/rapidjson.git
-  GIT_TAG 80b6d1c83402a5785c486603c5611923159d0894
-  GIT_SUBMODULES ""
-)
-FetchContent_GetProperties(rapidjson)
 if (NOT rapidjson_POPULATED)
-  FetchContent_Populate(rapidjson)
+  FetchContent_Populate(
+    rapidjson
+    GIT_REPOSITORY https://github.com/Tencent/rapidjson.git
+    GIT_TAG 80b6d1c83402a5785c486603c5611923159d0894
+    GIT_SUBMODULES ""
+  )
 endif()
+FetchContent_GetProperties(rapidjson)
 
 add_definitions("-DRAPIDJSON_HAS_STDSTRING=1")