[Preset] Add linux crosscompile android preset

Author: AndrewSB

utils/build-presets.ini

@@ -781,10 +781,27 @@ skip-test-libdispatch
 skip-test-playgroundsupport
 skip-test-libicu
 
+[preset: buildbot_linux_crosscompile_android,tools=RA,stdlib=RD,build]
+mixin-preset=buildbot_linux
+
+release
+assertions
+
+dash-dash
+
+android
+android-ndk=%(ndk_path)s
+android-api-level=21
+android-icu-uc=%(arm_dir)s/libicuucswift.so
+android-icu-uc-include=%(arm_dir)s/icu/source/common
+android-icu-i18n=%(arm_dir)s/libicui18nswift.so
+android-icu-i18n-include=%(arm_dir)s/icu/source/i18n
+
 # Ubuntu 18.04 preset for backwards compat and future customizations.
 [preset: buildbot_linux_1804]
 mixin-preset=buildbot_linux
 
+
 # Ubuntu 16.10 preset for backwards compat and future customizations.
 [preset: buildbot_linux_1610]
 mixin-preset=buildbot_linux