Changes:

 - use libpcre2 instead of libpcre
 - patch Src/Modules/pcre.c: source from mainstream's git (23.9.2023)
 - patch configure.ac and config.h.in: replace libpcre with libpcre2 and remove missing AC_PROG_LN
 - patch Src/Makefile.in: use LN_S instead of LN
 - patch Test/V07pcre.ztst: add some libpcre2 specific tests
 - use configure.ac instead of traditional configure: git version no longer supports traditional configure script, so it was easier to backport configure.ac for libpcre2

Auto-tools was missing AC_PROG_LN, configure.ac and Makefile.in patched to use AC_PROG_LN_S instead.

PKG_FIXUP:=autoreconf sets configure.ac used over traditional configure script.

Patches are split to 2.
010-use-libpcre2.patch replaces libpcre with libpcre2.
020-replace-missing-autotools-ln-with-ln_s.patch fixes autotools configure and install scripts so they are compatible with openwrt build system.

changes to replace libpcre with libpcre2 are based on
backporting of zsh-users/zsh@b4d1c756 pcre2 code.

Remarks:
Patch replacing libpcre with libpcre2 becomes obsolete when zsh is released next time.
It should then be removed.

Signed-off-by: Oskari Rauta <[email protected]>

utils/zsh/patches/010-use-libpcre2.patch

@@ -1,3 +1,12 @@
+This patch updates pcre module to use pcre2 instead of old pcre.
+It patches module to match with zsh-users/zsh@b4d1c756
+Patch also updates build scripts to match with same version
+on the parts of pcre related parts to allow it to be built.
+
+This patch becomes obsolete on next release of zsh which
+will contain all these changes directly from mainstream.
+
+Signed-off-by: Oskari Rauta <[email protected]>
 --- a/Src/Modules/pcre.c
 +++ b/Src/Modules/pcre.c
 @@ -34,11 +34,11 @@

utils/zsh/patches/020-replace-missing-autotools-ln-with-ln_s.patch

@@ -1,6 +1,8 @@
 Work-around to get past with missing @LN@ macro which
 is missing from openwrt's autotools. Can be removed
 if it is one day fixed in build tools.
+
+Signed-off-by: Oskari Rauta <[email protected]>
 --- a/Src/Makefile.in
 +++ b/Src/Makefile.in
 @@ -35,7 +35,7 @@ VPATH           = @srcdir@