Merge branch 'jk/asan-bonanza'

Various issues detected by Asan have been corrected.

* jk/asan-bonanza:
  t: enable ASan's strict_string_checks option
  fsck: avoid parse_timestamp() on buffer that isn't NUL-terminated
  fsck: remove redundant date timestamp check
  fsck: avoid strcspn() in fsck_ident()
  fsck: assert newline presence in fsck_ident()
  cache-tree: avoid strtol() on non-string buffer
  Makefile: turn on NO_MMAP when building with ASan
  pack-bitmap: handle name-hash lookups in incremental bitmaps
  compat/mmap: mark unused argument in git_munmap()

meson.build

@@ -1411,12 +1411,18 @@ if host_machine.system() == 'windows'
   libgit_c_args += '-DUSE_WIN32_MMAP'
 else
   checkfuncs += {
-    'mmap' : ['mmap.c'],
     # provided by compat/mingw.c.
     'unsetenv' : ['unsetenv.c'],
     # provided by compat/mingw.c.
     'getpagesize' : [],
   }
+
+  if get_option('b_sanitize').contains('address')
+    libgit_c_args += '-DNO_MMAP'
+    libgit_sources += 'compat/mmap.c'
+  else
+    checkfuncs += { 'mmap': ['mmap.c'] }
+  endif
 endif
 
 foreach func, impls : checkfuncs