ci: try to understand why readerwriterqueue not found

Author: jcelerier

bindings/python/CMakeLists.txt

@@ -3,7 +3,11 @@ project(pylibremidi)
 
 set(LIBREMIDI_HEADER_ONLY 1)
 set(LIBREMIDI_NEEDS_READERWRITERQUEUE 1)
+set(CMAKE_FIND_PACKAGE_TARGETS_GLOBAL 1)
 add_subdirectory(../.. libremidi-src)
+if(NOT TARGET readerwriterqueue)
+  message(FATAL_ERROR "readerwriterqueue not found ?")
+endif()
 find_package(Python 3.8 COMPONENTS Interpreter Development.Module REQUIRED)
 
 FetchContent_Declare(