pump: attempt to eliminate UnicodeDecodeError for good

All places where we read files, do so in 'latin-1' so that
all encodings are valid. As we only need to understand ASCII
stuff and ignore the rest this should work fine.

Does require python3.

include_server/compress_files.py

@@ -98,7 +98,7 @@ def Compress(self, include_closure, client_root_keeper, currdir_idx):
           # change its name.
           prefix = ""
         try:
-          real_file_fd = open(realpath, "r")
+          real_file_fd = open(realpath, "r", encoding='latin-1')
         except (IOError, OSError) as why:
           sys.exit("Could not open '%s' for reading: %s" % (realpath, why))
         try:

include_server/include_server.py

@@ -247,7 +247,7 @@ def _delete_temp_files():
                           translation_unit)
   # Using the primitive fd_d file descriptor for reading is cumbersome, so open
   # normally as well.
-  fd_d_ = open(name_d, "rb")
+  fd_d_ = open(name_d, "rb", encoding='latin-1')
   # Massage the contents of fd_d_
   dotd = re.sub("^.*:", # remove Makefile target
                 "",

include_server/parse_file.py

@@ -278,7 +278,7 @@ def Parse(self, filepath, symbol_table):
     includepath_map_index = self.includepath_map.Index
 
     try:
-      fd = open(filepath, "r")
+      fd = open(filepath, "r", encoding='latin-1')
     except IOError as msg:
       # This normally does not happen because the file should be known to
       # exists. Still there might be, say, a permissions issue that prevents it