Sync with 2.19.3

* maint-2.19: (34 commits)
  Git 2.19.3
  Git 2.18.2
  Git 2.17.3
  Git 2.16.6
  test-drop-caches: use `has_dos_drive_prefix()`
  Git 2.15.4
  Git 2.14.6
  mingw: handle `subst`-ed "DOS drives"
  mingw: refuse to access paths with trailing spaces or periods
  mingw: refuse to access paths with illegal characters
  unpack-trees: let merged_entry() pass through do_add_entry()'s errors
  quote-stress-test: offer to test quoting arguments for MSYS2 sh
  t6130/t9350: prepare for stringent Win32 path validation
  quote-stress-test: allow skipping some trials
  quote-stress-test: accept arguments to test via the command-line
  tests: add a helper to stress test argument quoting
  mingw: fix quoting of arguments
  Disallow dubiously-nested submodule git directories
  protect_ntfs: turn on NTFS protection by default
  path: also guard `.gitmodules` against NTFS Alternate Data Streams
  ...

diff --cc builtin/clone.c
Simple merge

diff --cc builtin/submodule--helper.c
index d38113a31aeb3838190b7339475c7454e45f3a89,382e823b3c2ae3db63f017625ef65be1f0291100..b93d624a859c2e321f92adf7676451011e662465
--- 1/builtin/submodule--helper.c
--- 2/builtin/submodule--helper.c
+++ b/builtin/submodule--helper.c
@@@ -1545,13 -1482,11 +1555,13 @@@ struct submodule_update_clone 
        /* failed clones to be retried again */
        const struct cache_entry **failed_clones;
        int failed_clones_nr, failed_clones_alloc;
 +
 +      int max_jobs;
  };
  #define SUBMODULE_UPDATE_CLONE_INIT {0, MODULE_LIST_INIT, 0, \
-       SUBMODULE_UPDATE_STRATEGY_INIT, 0, 0, -1, STRING_LIST_INIT_DUP, 0, \
+       SUBMODULE_UPDATE_STRATEGY_INIT, 0, 0, -1, STRING_LIST_INIT_DUP, 0, 0, \
        NULL, NULL, NULL, \
 -      STRING_LIST_INIT_DUP, 0, NULL, 0, 0}
 +      NULL, 0, 0, 0, NULL, 0, 0, 0}
  
  
  static void next_submodule_warn_missing(struct submodule_update_clone *suc,

diff --cc compat/mingw.c
Simple merge

diff --cc compat/mingw.h
Simple merge

diff --cc config.mak.uname
Simple merge

diff --cc connect.c
Simple merge

diff --cc environment.c
Simple merge

diff --cc fast-import.c
Simple merge

diff --cc fsck.c
Simple merge

diff --cc git-compat-util.h
Simple merge

diff --cc git-submodule.sh
Simple merge

diff --cc path.c
Simple merge

diff --cc read-cache.c
Simple merge

diff --cc submodule-config.c
Simple merge

diff --cc submodule.c
Simple merge

diff --cc submodule.h
Simple merge

diff --cc t/t0060-path-utils.sh
Simple merge

diff --cc t/t1450-fsck.sh
Simple merge

diff --cc t/t7406-submodule-update.sh
Simple merge

diff --cc t/t9300-fast-import.sh
Simple merge

diff --cc transport-helper.c
Simple merge

diff --cc tree-walk.c
Simple merge

diff --cc unpack-trees.c
Simple merge