gitlog-to-changelog: Drop scripts in favour of gnulib version

The ChangeLog automation scripts were incorporated in gnulib as
vcs-to-changelog for a while now since other projects expressed the
desire to use and extend this script.  In the interest of avoiding
duplication of code, drop the glibc version of gitlog-to-changelog and
use the gnulib one directly.

The only file that remains is vcstocl_quirks.py, which specifies
properties and quirks of the glibc project source code.  This patch
also drops the shebang at the start of vcstocl_quirks.py since the
file is not intended to be directly executable.

scripts/vcstocl_quirks.py

@@ -0,0 +1,65 @@
+# VCSToChangeLog Quirks for the GNU C Library.
+
+# Copyright (C) 2019-2020 Free Software Foundation, Inc.
+#
+# The GNU C Library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+#
+# The GNU C Library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with the GNU C Library; if not, see
+# <http://www.gnu.org/licenses/>.
+
+from frontend_c import Frontend
+from vcs_to_changelog import ProjectQuirks
+import re
+
+class GlibcProjectQuirks(ProjectQuirks):
+    repo = 'git'
+
+    IGNORE_LIST = [
+        'ChangeLog',
+        'sysdeps/x86_64/dl-trampoline.h'
+    ]
+
+    MACRO_QUIRKS = \
+        [{'orig': r'ElfW\((\w+)\)', 'sub': r'\1__ELF_NATIVE_CLASS_t'},
+         {'orig': r'(libc_freeres_fn)\s*\((\w+)\)', 'sub': r'static void \1__\2 (void)'},
+         {'orig': r'(IMPL)\s*\((\w+), .*\)$', 'sub': r'static void \1__\2 (void) {}'},
+         {'orig': r'__(BEGIN|END)_DECLS', 'sub': r''},
+         {'orig': 'weak_function', 'sub': '__attribute__ ((weak))'},
+         {'orig': r'ATTRIBUTE_(CONST|MALLOC|PURE|FORMAT)',
+          'sub': r'__attribute__ ((\1))'},
+         {'orig': r'__THROW', 'sub': r'__attribute__ ((__nothrow__ __LEAF))'},
+         {'orig': r'__THROWNL', 'sub': r'__attribute__ ((__nothrow__))'},
+         {'orig': r'__nonnull \(\(([^)]+)\)\)',
+          'sub': r'__attribute__ ((__nonnull__ \1))'},
+         {'orig': r'([^_])attribute_(\w+)', 'sub': r'\1__attribute__ ((\2))'},
+         {'orig': r'^attribute_(\w+)', 'sub': r'__attribute__ ((\1))'}]
+
+    def __init__(self, debug):
+        self.debug = debug
+        ''' Build a list of macro calls used for symbol versioning and attributes.
+
+        glibc uses a set of macro calls that do not end with a semi-colon and hence
+        breaks our parser.  Identify those calls from include/libc-symbols.h and
+        filter them out.
+        '''
+        with open('include/libc-symbols.h') as macrofile:
+            op = macrofile.readlines()
+            op = Frontend.remove_comments(self, op)
+            self.C_MACROS = [re.sub(r'.*define (\w+).*', r'\1', x[:-1]) for x in op \
+                             if 'define ' in x]
+
+        super().__init__()
+
+def get_project_quirks(debug):
+    ''' Accessor function.
+    '''
+    return GlibcProjectQuirks(debug)