libthread-db: Add dummy `td_init()`

packages/libthread-db/build.sh

@@ -3,6 +3,7 @@ TERMUX_PKG_DESCRIPTION="Thread debugging library"
 TERMUX_PKG_LICENSE="Apache-2.0"
 TERMUX_PKG_MAINTAINER="@termux"
 TERMUX_PKG_VERSION=22 # removed in NDK r23
+TERMUX_PKG_REVISION=1
 TERMUX_PKG_SRCURL=https://android.googlesource.com/platform/ndk/+archive/refs/tags/ndk-r${TERMUX_PKG_VERSION}/sources/android/libthread_db.tar.gz
 TERMUX_PKG_SHA256=SKIP_CHECKSUM
 TERMUX_PKG_BUILD_IN_SRC=true
@@ -10,15 +11,21 @@ TERMUX_PKG_BUILD_IN_SRC=true
 termux_extract_src_archive() {
 	local file="$TERMUX_PKG_CACHEDIR/$(basename "${TERMUX_PKG_SRCURL}")"
 	mkdir -p "$TERMUX_PKG_SRCDIR"
-	tar xf "$file" -C "$TERMUX_PKG_SRCDIR"
+	tar xf "$file" -C "$TERMUX_PKG_SRCDIR" libthread_db.c thread_db.h
+}
+
+termux_step_post_get_source() {
+	sha256sum -c $TERMUX_PKG_BUILDER_DIR/src.sha256sum
+	cp $TERMUX_PKG_BUILDER_DIR/td_init.c ./
 }
 
 termux_step_make() {
-	$CC $CPPFLAGS -I. $CFLAGS libthread_db.c -shared -o libthread_db.so $LDFLAGS
+	$CC $CPPFLAGS -I. $CFLAGS libthread_db.c td_init.c \
+		-shared -o libthread_db.so $LDFLAGS
 }
 
 termux_step_make_install() {
 	install -Dm600 -t $TERMUX_PREFIX/include "$TERMUX_PKG_SRCDIR/thread_db.h"
 	install -Dm600 -t $TERMUX_PREFIX/lib "$TERMUX_PKG_BUILDDIR/libthread_db.so"
-	ln -sf $TERMUX_PREFIX/lib/libthread_db.so $TERMUX_PREFIX/lib/libthread_db.so.1
+	ln -sf libthread_db.so $TERMUX_PREFIX/lib/libthread_db.so.1
 }

packages/libthread-db/src.sha256sum

@@ -0,0 +1,2 @@
+56f52c9cc9352beeb1aea24f1ff9cfead9bc86317c3cce53d9612098b027be8c  libthread_db.c
+72bbc352f3e2ca1c93109b00793c4d7a93dc6196836467b1a2c37fd54c2d4ce2  thread_db.h

packages/libthread-db/td_init.c

@@ -0,0 +1,4 @@
+#include <thread_db.h>
+td_err_e td_init(void) {
+    return TD_OK;
+}