cmake: don't use CMAKE_SOURCE_DIR

Author: Hugobros3

src/shady/CMakeLists.txt

@@ -117,5 +117,5 @@ target_link_libraries(shady INTERFACE "common")
 target_link_libraries(shady PRIVATE "$<BUILD_INTERFACE:m>")
 target_link_libraries(shady PRIVATE "$<BUILD_INTERFACE:SPIRV-Headers::SPIRV-Headers>")
 
-install(DIRECTORY ${CMAKE_SOURCE_DIR}/include/shady DESTINATION include)
+install(DIRECTORY ${PROJECT_SOURCE_DIR}/include/shady DESTINATION include)
 install(TARGETS shady EXPORT shady_export_set ARCHIVE DESTINATION ${CMAKE_ARCHIVE_OUTPUT_DIRECTORY})

src/shady/api/CMakeLists.txt

@@ -1,5 +1,5 @@
 add_library(api INTERFACE)
-target_include_directories(api INTERFACE "$<BUILD_INTERFACE:${CMAKE_SOURCE_DIR}/include>" "$<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}>" "$<INSTALL_INTERFACE:include>")
+target_include_directories(api INTERFACE "$<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/include>" "$<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}>" "$<INSTALL_INTERFACE:include>")
 target_include_directories(api INTERFACE "$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/..>")
 
 get_target_property(SPIRV_HEADERS_INCLUDE_DIRS SPIRV-Headers::SPIRV-Headers INTERFACE_INCLUDE_DIRECTORIES)