desubmodulize libsndfile - PLEASE READ

it appears a one-character typo in the cmake_minimum_required line prevents it from compiling under CMake 4.0.
in order to fix that, I had to take this thing out of submodules...

it is recommended to do this after you pull;

git submodule deinit extern/libsndfile

extern/libsndfile-modified/src/binheader_writef_check.py

@@ -0,0 +1,114 @@
+#!/usr/bin/python
+
+# Copyright (C) 2006-2017 Erik de Castro Lopo <erikd@mega-nerd.com>
+#
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+#       notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above copyright
+#       notice, this list of conditions and the following disclaimer in
+#       the documentation and/or other materials provided with the
+#       distribution.
+#     * Neither the author nor the names of any contributors may be used
+#       to endorse or promote products derived from this software without
+#       specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+# TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+# EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+# OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+# OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+# ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+# This parses C code using regexes (yes, thats horrible) and makes sure
+# that calling conventions to the function psf_binheader_writef are
+# correct.
+
+
+
+import re, string, sys
+
+_whitespace_re = re.compile ("\s+", re.MULTILINE)
+
+def find_binheader_writefs (data):
+    lst = re.findall ('psf_binheader_writef\s*\(\s*[a-zA-Z_]+\s*,\s*\"[^;]+;', data, re.MULTILINE)
+    return [_whitespace_re.sub (" ", x) for x in lst]
+
+def find_format_string (s):
+    fmt = re.search ('"([^"]+)"', s)
+    if not fmt:
+        print ("Bad format in :\n\n\t%s\n\n" % s)
+        sys.exit (1)
+    fmt = fmt.groups ()
+    if len (fmt) != 1:
+        print ("Bad format in :\n\n\t%s\n\n" % s)
+        sys.exit (1)
+    return _whitespace_re.sub ("", fmt [0])
+
+def get_param_list (data):
+    dlist = re.search ("\((.+)\)\s*;", data)
+    dlist = dlist.groups ()[0]
+    dlist = dlist.split(",")
+    dlist = [x.strip() for x in dlist]
+    return dlist [2:]
+
+def handle_file (fname):
+    errors = 0
+    data = open (fname, "r").read ()
+
+    # return errors
+
+    writefs = find_binheader_writefs (data)
+    for item in writefs:
+        fmt = find_format_string (item)
+        params = get_param_list (item)
+        param_index = 0
+
+        # print item
+
+        for ch in fmt:
+            if ch in 'Eet ':
+                continue
+
+            if ch == 'b':
+                if params [param_index][:4] == "BHWv" and params [param_index + 1][:4] == "BHWz":
+                    param_index += 2
+                    continue
+
+            if "BHW" + ch == params [param_index][:4]:
+                param_index += 1
+                continue
+
+            if errors == 0: sys.stdout.write ("\n")
+            print ("\n%s: error for format specifier '%c' (index %d) in:\n    %s\n" % (fname, ch, param_index, item))
+            errors += 1
+            # Break out of 'for ch in fmt' loop
+            break
+
+    return errors
+
+#===============================================================================
+
+if len (sys.argv) > 1:
+    sys.stdout.write ("\n    binheader_writef_check                   : ")
+    sys.stdout.flush ()
+    errors = 0
+    for fname in sys.argv [1:]:
+        errors += handle_file (fname)
+    if errors > 0:
+        print ("\nErrors : %d\n" % errors)
+        sys.exit (1)
+
+print ("ok\n")
+