add tests.

src/thread/CMakeLists.txt

@@ -4,21 +4,21 @@
 # https://opensource.org/licenses/MIT
 
 # Sources
-target_sources(${DUSK_TARGET_NAME}
-  PRIVATE
+target_sources(${DUSK_LIBRARY_TARGET_NAME}
+  PUBLIC
     thread.c
     threadmutex.c
 )
 
 # Compiler flags.
 if(DUSK_TARGET_SYSTEM STREQUAL "linux")
-  target_compile_definitions(${DUSK_TARGET_NAME}
-    PRIVATE
+  target_compile_definitions(${DUSK_LIBRARY_TARGET_NAME}
+    PUBLIC
       THREAD_PTHREAD=1
   )
 elseif(DUSK_TARGET_SYSTEM STREQUAL "psp")
-  target_compile_definitions(${DUSK_TARGET_NAME}
-    PRIVATE
+  target_compile_definitions(${DUSK_LIBRARY_TARGET_NAME}
+    PUBLIC
       THREAD_PTHREAD=1
   )
 endif()