[buildsystem] Fix libstdlib to use CMAKE_CURRENT_SOURCE_DIR.

libstdlib/CMakeLists.txt

@@ -1,18 +1,18 @@
 # This will re-generate the headers if any file within src was modified.
-set_directory_properties(PROPERTY CMAKE_CONFIGURE_DEPENDS ${PROJECT_SOURCE_DIR}/stdlib/src/)
+set_directory_properties(PROPERTY CMAKE_CONFIGURE_DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/src/)
 
 set(STDLIB stub)
 set(GENERATED_STDLIB_HEADERS)
 foreach(src IN LISTS STDLIB)
-    set(STDLIB_FILE ${PROJECT_SOURCE_DIR}/libstdlib/src/${src}.sol)
+    set(STDLIB_FILE ${CMAKE_CURRENT_SOURCE_DIR}/src/${src}.sol)
     file(READ ${STDLIB_FILE} STDLIB_FILE_CONTENT HEX)
     string(REGEX MATCHALL ".." STDLIB_FILE_CONTENT "${STDLIB_FILE_CONTENT}")
     list(REMOVE_ITEM STDLIB_FILE_CONTENT "0d")
     string(REGEX REPLACE ";" ",\n\t0x" STDLIB_FILE_CONTENT "${STDLIB_FILE_CONTENT}")
     set(STDLIB_FILE_CONTENT "0x${STDLIB_FILE_CONTENT}")
     set(STDLIB_FILE_NAME ${src})
-    configure_file("${PROJECT_SOURCE_DIR}/libstdlib/stdlib.src.h.in" ${PROJECT_BINARY_DIR}/include/libstdlib/${src}.h NEWLINE_STYLE LF @ONLY)
+    configure_file("${CMAKE_CURRENT_SOURCE_DIR}/stdlib.src.h.in" ${PROJECT_BINARY_DIR}/include/libstdlib/${src}.h NEWLINE_STYLE LF @ONLY)
     list(APPEND GENERATED_STDLIB_HEADERS ${PROJECT_BINARY_DIR}/include/libstdlib/${src}.h)
 endforeach()
 
-configure_file("${PROJECT_SOURCE_DIR}/libstdlib/stdlib.h.in" ${PROJECT_BINARY_DIR}/include/libstdlib/stdlib.h NEWLINE_STYLE LF @ONLY)
+configure_file("${CMAKE_CURRENT_SOURCE_DIR}/stdlib.h.in" ${PROJECT_BINARY_DIR}/include/libstdlib/stdlib.h NEWLINE_STYLE LF @ONLY)