thirdparty.zstd: upgrade to v1.5.7 release, add the local changes to a reusable .patch file (#24611)

Author: kbkpbot

thirdparty/zstd/fix.md

@@ -1,28 +1,9 @@
-1. replace all `abs64` with `zstd_abs64`.
+1. Get `zstd` from https://github.com/facebook/zstd/releases
+2. Download and extract `zstd`, and goto `zstd-1.5.7/build/single_file_libs/`, run `create_single_file_library.sh`
+3. Copy generated `zstd.c` to v's `thirdparty/zstd/zstd-1.5.7.c`
+4. In `thirdparty/zstd/`, apply patch by `patch -p0 -i zstd_v.patch -o zstd.c`
+5. Remove `zstd-1.5.7.c`
 
-2. add following at header of the file:
-#if defined(__TINYC__)
-#if defined(_WIN32)
-#undef ZSTD_MULTITHREAD
-#define ZSTD_NO_INTRINSICS
-#endif
-#if defined(__arm__) || defined(__aarch64__)
-#define NO_PREFETCH
-#endif
-#endif
-
-3. replace `qsort_r` with `qsort`, as there is no way detect __MUSL__ macro. add following at header of the file:
-#ifndef ZDICT_QSORT
-# if defined(__APPLE__)
-#   define ZDICT_QSORT ZDICT_QSORT_APPLE /* uses qsort_r() with a different order for parameters */
-# elif defined(__GLIBC__)
-#   define ZDICT_QSORT ZDICT_QSORT_GNU /* uses qsort_r() */
-# elif defined(_WIN32) && defined(_MSC_VER)
-#   define ZDICT_QSORT ZDICT_QSORT_MSVC /* uses qsort_s() with a different order for parameters */
-# elif defined(STDC_LIB_EXT1) && (STDC_LIB_EXT1 > 0) /* C11 Annex K */
-#   define ZDICT_QSORT ZDICT_QSORT_C11 /* uses qsort_s() */
-# else
-#   define ZDICT_QSORT ZDICT_QSORT_C90 /* uses standard qsort() which is not re-entrant (requires global variable) */
-# endif
-#endif
+You can generate a new patch by `diff -u zstd-1.5.7.c zstd_modified.c > zstd_custom.patch`
 
+BTW, patch is between `/* >> v_patch start */` and `/* << v_patch end */` mostly.