Update python bindings errors when looking for lib

Make error helpful when python cannot find the libiio C library

Signed-off-by: Travis F. Collins <[email protected]>

bindings/python/iio/__init__.py

@@ -298,9 +298,12 @@ class ChannelType(Enum):
     _iiolib = "libiio.dll"
 else:
     # Non-windows, possibly Posix system
-    _iiolib = "iio"
+    _iiolib = "libiio.so.1"
 
-_lib = _cdll("libiio.so.1", use_errno=True, use_last_error=True)
+_lib_loc = find_library(_iiolib)
+if _lib_loc is None:
+    raise OSError(2, "Could not find libiio C library")
+_lib = _cdll(_lib_loc, use_errno=True, use_last_error=True)
 _libc = _cdll(find_library("c"))
 
 _get_backends_count = _lib.iio_get_builtin_backends_count