ci: install rapidjson from the system

Build stopped on every file that includes rsjson.h:

    rapidjson/document.h: No such file or directory

and the compile line carried no -I for it. CMakeLists.txt resolves rapidjson in
three steps: find_path in the system, then ../supportlibs/rapidjson, then
FetchContent. The third branch calls FetchContent_MakeAvailable(rapidjson) and
stops there -- it never adds an include directory for what it just downloaded,
so nothing reaches the compiler.

The super-project always takes the second branch, its submodule being present,
which is why this only shows up in a standalone build.

Installing the system package makes the first branch match, which is also what
the super-project's other CIs do: rapidjson-dev, mingw-w64-ucrt-x86_64-rapidjson,
rapidjson.

.github/workflows/macos-cmake.yml

@@ -50,7 +50,7 @@ jobs:
         brew install
         cmake ninja pkg-config
         openssl@3 botan@2 sqlcipher miniupnpc json-c
-        bzip2 zlib doxygen gnu-sed
+        bzip2 zlib doxygen gnu-sed rapidjson
 
     # The restbed patch step of CMakeLists.txt runs `sed -i -e ...`, which is
     # GNU syntax: BSD sed reads the argument after -i as a backup suffix and

.github/workflows/ubuntu-cmake.yml

@@ -52,7 +52,7 @@ jobs:
         sudo apt-get update &&
         sudo apt-get install -y
         build-essential g++ cmake ninja-build pkg-config git
-        libssl-dev zlib1g-dev libbz2-dev libjson-c-dev libbotan-2-dev
+        libssl-dev zlib1g-dev libbz2-dev libjson-c-dev libbotan-2-dev rapidjson-dev
         libsqlcipher-dev libminiupnpc-dev
         doxygen python3
 

.github/workflows/windows-cmake.yml

@@ -61,6 +61,7 @@ jobs:
             mingw-w64-ucrt-x86_64-doxygen
             mingw-w64-ucrt-x86_64-openssl
             mingw-w64-ucrt-x86_64-libbotan
+            mingw-w64-ucrt-x86_64-rapidjson
             mingw-w64-ucrt-x86_64-sqlcipher
             mingw-w64-ucrt-x86_64-miniupnpc
             mingw-w64-ucrt-x86_64-json-c