Enable arm64 build

[swift-kim]

• Set build_engine_artifacts to false since we're cross-building on x64 (we don't need SDK artifacts)
• Update azure-pipelines.yaml for continuous integration
• Add the "common" device profile

[swift-kim]

I chose a profile factor of 0.5 for kCommon because it just looked good on my monitor. Actually the Tizen system info returns a dpi value of 210 which is larger than expected (around 91). I don't know how to choose a right value. Texts might be too small on higher dpi monitors.

[swift-kim]

Note that you need to update the toolchain (https://github.com/flutter-tizen/tizen_tools/pull/7) to build for arm64.

[wiertel]

I've tried building it and found 2 fails (maybe my environment is affecting it).

1. flutter/tools/gn reports error, it expects pkgconfig directory in sysroot/arm64/usr/lib and fails to find it in sysroot/arm64/usr/lib64. I've symlinked ../lib/pkgconfig into lib64 to work around it.

ERROR at //build/config/linux/pkg_config.gni:103:17: Script returned non-zero exit code.
   pkgresult = exec_script(pkg_config_script, args, "value")
               ^----------
Current dir: /mnt/tizen/flutter/engine-build/engine/src/out/linux_release_arm64/
Command: python /mnt/tizen/flutter/engine-build/engine/src/build/config/linux/pkg-config.py -s /mnt/tizen/flutter/tizen_tools/sysroot/arm64 -a arm64 --system_libdir lib freetype2
Returned 1.
stderr:

Package freetype2 was not found in the pkg-config search path.
Perhaps you should add the directory containing `freetype2.pc'
to the PKG_CONFIG_PATH environment variable
No package 'freetype2' found
Traceback (most recent call last):
 File "/mnt/tizen/flutter/engine-build/engine/src/build/config/linux/pkg-config.py", line 248, in <module>
   sys.exit(main())
 File "/mnt/tizen/flutter/engine-build/engine/src/build/config/linux/pkg-config.py", line 143, in main
   prefix = GetPkgConfigPrefixToStrip(options, args)
 File "/mnt/tizen/flutter/engine-build/engine/src/build/config/linux/pkg-config.py", line 82, in GetPkgConfigPrefixToStrip
   "--variable=prefix"] + args, env=os.environ).decode('utf-8')
 File "/usr/lib/python2.7/subprocess.py", line 223, in check_output
   raise CalledProcessError(retcode, cmd, output=output)
subprocess.CalledProcessError: Command '['pkg-config', '--variable=prefix', 'freetype2']' returned non-zero exit status 1

See //build/config/linux/BUILD.gn:30:1: whence it was called.
pkg_config("freetype2") {
^------------------------
See //build/config/BUILDCONFIG.gn:357:33: which caused the file to be included.
 _native_compiler_configs += [ "//build/config/linux:sdk" ]
                               ^-------------------------

2. ninja build failed with errors in flutter-tizen.cc related to long/long long mismatch like:

../../flutter/shell/platform/tizen/flutter_tizen.cc:194:53: error: format specifies type 'long long' but the argument has type 'int64_t' (aka 'long') [-Werror,-Wformat]
    FT_LOGE("can't find texture texture_id = %lld", texture_id);

[swift-kim]

@wiertel

1. I usually redirects PKG_CONFIG_PATH to the host's freetype.pc (see the bottom of this page) but your workaround looks better for me.
   → I applied the symlink approach in https://github.com/flutter-tizen/tizen_tools/pull/7/commits/1a354ff0c5d6bdbaa697541e5a38ee73376c44b7 and 8a5a9f4. I don't know which is the "right" way to resolve this issue but the freetype2 dependency itself will be removed in the future.
2. I already patched all occurrences of %lld (see the diff) so it shouldn't appear in the code.

[bbrto21]

LGTM

[bbrto21]

It looks better than I mentioned before.

[wiertel]

I can now confirm that this change works.
The second issue was my mistake - I didn't have this PR applied to repo cloned by gclient. After fixing that I was able to compile and run a flutter app on 64bit Tizen IoT.