[cmake] refactor: CPM over vcpkg

Signed-off-by: crueter <crueter@eden-emu.dev>

.patch/httplib/0001-ssl-libs.patch

@@ -0,0 +1,34 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 5638fb9..6e24c74 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -113,16 +113,8 @@ endif()
+ # Threads needed for <thread> on some systems, and for <pthread.h> on Linux
+ set(THREADS_PREFER_PTHREAD_FLAG true)
+ find_package(Threads REQUIRED)
+-# Since Cmake v3.11, Crypto & SSL became optional when not specified as COMPONENTS.
+-if(HTTPLIB_REQUIRE_OPENSSL)
+-	find_package(OpenSSL ${_HTTPLIB_OPENSSL_MIN_VER} COMPONENTS Crypto SSL REQUIRED)
+-elseif(HTTPLIB_USE_OPENSSL_IF_AVAILABLE)
+-	find_package(OpenSSL ${_HTTPLIB_OPENSSL_MIN_VER} COMPONENTS Crypto SSL QUIET)
+-endif()
+-# Just setting this variable here for people building in-tree
+-if(OPENSSL_FOUND AND NOT DEFINED HTTPLIB_IS_USING_OPENSSL)
+-	set(HTTPLIB_IS_USING_OPENSSL TRUE)
+-endif()
++
++set(HTTPLIB_IS_USING_OPENSSL TRUE)
+ 
+ if(HTTPLIB_REQUIRE_ZLIB)
+ 	find_package(ZLIB REQUIRED)
+@@ -227,8 +219,8 @@ target_link_libraries(${PROJECT_NAME} ${_INTERFACE_OR_PUBLIC}
+ 		$<$<BOOL:${HTTPLIB_IS_USING_BROTLI}>:Brotli::encoder>
+ 		$<$<BOOL:${HTTPLIB_IS_USING_BROTLI}>:Brotli::decoder>
+ 		$<$<BOOL:${HTTPLIB_IS_USING_ZLIB}>:ZLIB::ZLIB>
+-		$<$<BOOL:${HTTPLIB_IS_USING_OPENSSL}>:OpenSSL::SSL>
+-		$<$<BOOL:${HTTPLIB_IS_USING_OPENSSL}>:OpenSSL::Crypto>
++		$<$<BOOL:${HTTPLIB_IS_USING_OPENSSL}>:ssl>
++		$<$<BOOL:${HTTPLIB_IS_USING_OPENSSL}>:crypto>
+ )
+ 
+ # Set the definitions to enable optional features