Bump Android NDK version to r29

Update Android NDK references from r27/r27c to r29 across the build scripts and docs. Changes update android/README.md, set NDK_VERSION=r29 in android/android-env.sh, and adjust the ndk_version in android/patches/3.13_pending.patch to 29.0.14206865 so builds use the newer NDK.

Author: FeodorFitsner

android/README.md

@@ -4,7 +4,7 @@ Scripts and CI jobs for building Python 3 for Android.
 
 * Can be run on both Linux and macOS.
 * Build Python 3.12 - specific or the last minor version.
-* Installs NDK r26d or use pre-installed one with path configured by `NDK_HOME` variable.
+* Installs NDK r29 or use pre-installed one with path configured by `NDK_HOME` variable.
 * Creates Python installation with a structure suitable for https://github.com/flet-dev/mobile-forge
 
 ## Usage
@@ -30,4 +30,4 @@ Based on the work from:
 * https://github.com/chaquo/chaquopy/tree/master/target
 * https://github.com/beeware/Python-Android-support
 * https://github.com/beeware/cpython-android-source-deps
-* https://github.com/GRRedWings/python3-android
+* https://github.com/GRRedWings/python3-android

android/android-env.sh

@@ -5,7 +5,7 @@
 : ${api_level:=24}  # Minimum Android API level the build will run on
 : ${PREFIX:-}  # Path in which to find required libraries
 
-NDK_VERSION=r27c
+NDK_VERSION=r29
 
 # Print all messages on stderr so they're visible when running within build-wheel.
 log() {

android/patches/3.13_pending.patch

@@ -7,7 +7,7 @@ index 93372e3fe1c..94712602a23 100644
  #   where XX is the NDK version. Do a diff against the version you're upgrading from, e.g.:
  #   https://android.googlesource.com/platform/ndk/+/ndk-r25-release..ndk-r26-release/docs/BuildSystemMaintainers.md
 -ndk_version=26.2.11394342
-+ndk_version=27.1.12297006
++ndk_version=29.0.14206865
 
  ndk=$ANDROID_HOME/ndk/$ndk_version
  if ! [ -e $ndk ]; then