Roll buildroot to c37164f (flutter#27967)

This eliminates the landmines hook.

build/landmines.py writes out a .landmines file at the root of the
buildroot. The first step of a `gclient sync` is to check for diffs
between that file and the new one, and if found, a clobber is performed.

We never actually use this functionality, and the code calls rmtree()
which (at least on macos) appears to choke on symlinks.

This deletes these scripts, and will be paired with the deletion of the
first gclient hook in the DEPS file in flutter/engine during the roll.

If we ever need this functionality, it's relatively straightforward to
add it back.

Issue: flutter#87960

Author: cbracken

DEPS

@@ -97,7 +97,7 @@ allowed_hosts = [
 ]
 
 deps = {
-  'src': 'https://github.com/flutter/buildroot.git' + '@' + 'bab43eb08cff63e71de5e7fe816ccf2aea3576a4',
+  'src': 'https://github.com/flutter/buildroot.git' + '@' + 'c37164f39300c6e42560a5853e16a919688f7b86',
 
    # Fuchsia compatibility
    #
@@ -631,17 +631,6 @@ deps = {
 }
 
 hooks = [
-  {
-    # This clobbers when necessary (based on get_landmines.py). It must be the
-    # first hook so that other things that get/generate into the output
-    # directory will not subsequently be clobbered.
-    'name': 'landmines',
-    'pattern': '.',
-    'action': [
-        'python3',
-        'src/build/landmines.py',
-    ],
-  },
   {
     # Update the Windows toolchain if necessary.
     'name': 'win_toolchain',