refactor ebcc codec, fix buffer issue

Author: huanglangwen

ebcc/zarr_filter.py

@@ -20,14 +20,6 @@ class EBCCZarrFilter(Codec):
 
     def __init__(self, arglist):
         self.arglist = np.array(arglist, dtype=np.uint32)
-        if sys.platform.startswith('linux'):
-            self.c_stdlib = ctypes.CDLL('libc.so.6')
-        elif sys.platform == 'darwin':
-            self.c_stdlib = ctypes.CDLL('libc.dylib')
-        elif sys.platform == 'win32':
-            self.c_stdlib = ctypes.CDLL('msvcrt.dll')
-        else:
-            raise RuntimeError("Unsupported platform: " + sys.platform)
         self.lib = ctypes.CDLL(EBCC_FILTER_PATH)
         self.lib.populate_config.argtypes = [
             ctypes.POINTER(CodecConfigT),