Resolve sibling component paths relative to the current directory

ps2xRecomp and ps2xAnalyzer reached ps2xRuntime through CMAKE_SOURCE_DIR,
which is the top-level source directory of whatever build is running. That
holds only when this repository is itself the top level; adding it to another
project with add_subdirectory() made both components look for
ps2xRuntime/cmake/ReleaseMode.cmake under the consuming project and fail at
configure time.

Use CMAKE_CURRENT_SOURCE_DIR-relative paths, as ps2xRecomp already does for
its ps2xRuntime include directory and ps2xRuntime does for its own cmake
include. Note that each component declares its own project(), so
PROJECT_SOURCE_DIR is not an alternative here.

ps2xAnalyzer/CMakeLists.txt

@@ -27,8 +27,8 @@ add_library(ps2_analyzer_lib STATIC ${PS2ANALYZER_LIB_SOURCES})
 
 target_include_directories(ps2_analyzer_lib PUBLIC
     ${CMAKE_CURRENT_SOURCE_DIR}/include
-    ${CMAKE_SOURCE_DIR}/ps2xRecomp/include
-    ${CMAKE_SOURCE_DIR}/ps2xRuntime/include
+    ${CMAKE_CURRENT_SOURCE_DIR}/../ps2xRecomp/include
+    ${CMAKE_CURRENT_SOURCE_DIR}/../ps2xRuntime/include
 )
 
 target_link_libraries(ps2_analyzer_lib PUBLIC
@@ -50,7 +50,7 @@ install(TARGETS ps2_analyzer ps2_analyzer_lib
     ARCHIVE DESTINATION lib
 )
 
-include("${CMAKE_SOURCE_DIR}/ps2xRuntime/cmake/ReleaseMode.cmake")
+include("${CMAKE_CURRENT_SOURCE_DIR}/../ps2xRuntime/cmake/ReleaseMode.cmake")
 
 if(CMAKE_BUILD_TYPE STREQUAL "Release" OR CMAKE_BUILD_TYPE STREQUAL "RelWithDebInfo")
     EnableFastReleaseMode(ps2_analyzer_lib)

ps2xRecomp/CMakeLists.txt

@@ -130,7 +130,7 @@ install(DIRECTORY include/
     DESTINATION include
 )
 
-include("${CMAKE_SOURCE_DIR}/ps2xRuntime/cmake/ReleaseMode.cmake")
+include("${CMAKE_CURRENT_SOURCE_DIR}/../ps2xRuntime/cmake/ReleaseMode.cmake")
 
 if(CMAKE_BUILD_TYPE STREQUAL "Release" OR CMAKE_BUILD_TYPE STREQUAL "RelWithDebInfo")
     EnableFastReleaseMode(ps2_recomp_lib)