[build_manager] Dont define unused constant (#4196)

Author: jonathanmetzman

src/clusterfuzz/_internal/build_management/build_manager.py

@@ -62,9 +62,6 @@
 # target).
 PARTIAL_BUILD_FILE = '.partial_build'
 
-# ICU data file.
-ICU_DATA_FILENAME = 'icudtl.dat'
-
 # Time for unpacking a build beyond which an error should be logged.
 UNPACK_TIME_LIMIT = 60 * 20