Fix bsv_src_root

files_root is actually the directory where the fusesoc command was
executed, but what we want here is the location of the python file being
executed so we can find the bluespec sources

fusesoc/fusesoc-script.py

@@ -36,7 +36,9 @@ print(capwidth)
 workdir = os.getcwd()
 
 # location of source files is actually one level above the location of the core file
-bsv_src_root = yamlcfg["files_root"] + "/.."
+bsv_src_root = os.path.join(os.path.dirname(__file__), "..")
+print("bsv_src_root")
+print(bsv_src_root)
 
 # set up bluespec command + arguments
 bscargs = list()