gdb, gdbserver, gdbsupport: trim trailing whitespaces

I noticed my IDE (VSCode) starting to automatically trim trailing
whitespaces on save, despite the setting for it being disabled.  I
realized that this is because the .editorconfig file now has

    trim_trailing_whitespace = true

for many file types.  If we have this EditorConfig setting forcing
editors to trim trailing whitespaces, I think it would make sense to
clean up trailing whitespaces from our files.  Otherwise, people will
always get spurious whitespace changes when editing these files.

I did a mass cleanup using this command:

$ find gdb gdbserver gdbsupport -type f \( \
    -name "*.c" -o \
    -name "*.h" -o \
    -name "*.cc" -o \
    -name "*.texi" -o \
    -name "*.exp" -o \
    -name "*.tcl" -o \
    -name "*.py" -o \
    -name "*.s" -o \
    -name "*.S" -o \
    -name "*.asm" -o \
    -name "*.awk" -o \
    -name "*.ac" -o \
    -name "Makefile*" -o \
    -name "*.sh" -o \
    -name "*.adb" -o \
    -name "*.ads" -o \
    -name "*.d" -o \
    -name "*.go" -o \
    -name "*.F90" -o \
    -name "*.f90" \
\) -exec sed -ri 's/[ \t]+$//' {} +

I then did an autotools regen, because we don't actually want to change
the Makefile and Makefile.in files that are generated.

Change-Id: I6f91b83e3b8c4dc7d5d51a2ebf60706120efe691

gdbsupport/event-loop.cc

@@ -247,7 +247,7 @@ gdb_do_one_event (int mstimeout)
 
   std::optional<int> timer_id;
 
-  SCOPE_EXIT 
+  SCOPE_EXIT
     {
       if (timer_id.has_value ())
 	delete_timer (*timer_id);
@@ -397,7 +397,7 @@ get_next_file_handler_to_handle_and_advance (void)
   return curr_next;
 }
 
-/* Remove the file descriptor FD from the list of monitored fd's: 
+/* Remove the file descriptor FD from the list of monitored fd's:
    i.e. we don't care anymore about events on the FD.  */
 void
 delete_file_handler (int fd)
@@ -455,7 +455,7 @@ delete_file_handler (int fd)
 	}
     }
 
-  /* Deactivate the file descriptor, by clearing its mask, 
+  /* Deactivate the file descriptor, by clearing its mask,
      so that it will not fire again.  */
 
   file_ptr->mask = 0;

gdbsupport/event-loop.h

@@ -92,8 +92,8 @@ extern void add_file_handler (int fd, handler_func *proc,
 			      gdb_client_data client_data,
 			      std::string &&name, bool is_ui = false);
 
-extern int create_timer (int milliseconds, 
-			 timer_handler_func *proc, 
+extern int create_timer (int milliseconds,
+			 timer_handler_func *proc,
 			 gdb_client_data client_data);
 extern void delete_timer (int id);
 

gdbsupport/gdb_vecs.cc

@@ -59,7 +59,7 @@ std::vector<gdb::unique_xmalloc_ptr<char>>
 delim_string_to_char_ptr_vec (const char *str, char delimiter)
 {
   std::vector<gdb::unique_xmalloc_ptr<char>> retval;
-  
+
   delim_string_to_char_ptr_vec_append (&retval, str, delimiter);
 
   return retval;
@@ -80,7 +80,7 @@ std::vector<gdb::unique_xmalloc_ptr<char>>
 dirnames_to_char_ptr_vec (const char *dirnames)
 {
   std::vector<gdb::unique_xmalloc_ptr<char>> retval;
-  
+
   dirnames_to_char_ptr_vec_append (&retval, dirnames);
 
   return retval;

gdbsupport/print-utils.h

@@ -78,9 +78,9 @@ extern const char *hex_string_custom (LONGEST num, int width);
 
 /* Convert VAL to a numeral in the given radix.  For
  * radix 10, IS_SIGNED may be true, indicating a signed quantity;
- * otherwise VAL is interpreted as unsigned.  If WIDTH is supplied, 
+ * otherwise VAL is interpreted as unsigned.  If WIDTH is supplied,
  * it is the minimum width (0-padded if needed).  USE_C_FORMAT means
- * to use C format in all cases.  If it is false, then 'x' 
+ * to use C format in all cases.  If it is false, then 'x'
  * and 'o' formats do not include a prefix (0x or leading 0).  */
 
 extern const char *int_string (LONGEST val, int radix, int is_signed, int width,

gdbsupport/ptid.cc

@@ -1,7 +1,7 @@
 /* The ptid_t type and common functions operating on it.
 
    Copyright (C) 1986-2025 Free Software Foundation, Inc.
-   
+
    This file is part of GDB.
 
    This program is free software; you can redistribute it and/or modify