Fix check

Signed-off-by: Filipe Laíns <[email protected]

Author: FFY00

Modules/getpath.py

@@ -789,7 +789,7 @@ def search_up(prefix, *landmarks, test=isfile):
 
 # When running Python from the build directory, if libpython is dynamically
 # linked, the wrong library might be loaded.
-if build_prefix and library and not build_prefix.startswith(dirname(abspath(library))):
+if build_prefix and library and not dirname(abspath(library)).startswith(build_prefix):
     msg = f'The runtime library has been loaded from outside the build directory ({library})!'
     if os_name == 'posix':
         msg += ' Consider setting LD_LIBRARY_PATH=. to force it to be loaded from the build directory.'