please.sh: accept --architecture=ucrt64 in create_sdk_artifact

create_sdk_artifact's `case "$architecture" in` ladder hard-maps
x86_64 to MSYSTEM=MINGW64 / PREFIX=/mingw64, writes that into the
artifact's /etc/profile, and calls make-file-list.sh with
ARCH=$architecture. Against the new UCRT64 git-sdk-64
(git-for-windows/git-sdk-64#117), the
resulting artifact is broken: the profile points at /mingw64/bin
which doesn't exist, and the listed packages all carry the wrong
Pacman prefix.

Add a new ucrt64 architecture value that maps to MSYSTEM=UCRT64 and
PREFIX=/ucrt64 while keeping SDK_REPO=git-sdk-64 (the SDK has not
been renamed). The caller asks for the new flavor explicitly; the
make-file-list.sh side already knows what ARCH=ucrt64 means after
the previous commit.

Auto-detection is deliberately left alone: a dual-tree SDK (one
with both /mingw64 and /ucrt64) is rare enough that guessing the
wrong default would be more surprising than requiring the caller to
say what they want.

Assisted-by: Opus 4.7
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

Author: dscho

please.sh

@@ -389,7 +389,7 @@ bundle_pdbs () { # [--directory=<artifacts-directory] [--unpack=<directory>] [--
 	done
 }
 
-create_sdk_artifact () { # [--out=<directory>] [--git-sdk=<directory>] [--architecture=(x86_64|i686|aarch64|auto)] [--bitness=(32|64)] [--force] <name>
+create_sdk_artifact () { # [--out=<directory>] [--git-sdk=<directory>] [--architecture=(x86_64|i686|aarch64|ucrt64|auto)] [--bitness=(32|64)] [--force] <name>
 	git_sdk_path=/
 	output_path=
 	force=
@@ -490,6 +490,11 @@ create_sdk_artifact () { # [--out=<directory>] [--git-sdk=<directory>] [--archit
 	fi
 
 	case "$architecture" in
+	ucrt64)
+		MSYSTEM=UCRT64
+		PREFIX="/ucrt64"
+		SDK_REPO="git-sdk-64"
+		;;
 	x86_64)
 		MSYSTEM=MINGW64
 		PREFIX="/mingw64"