Until the commit https://github.com/google/skia/commit/0d6f81593b1fa222e8e4afb56cc961ce8c9be375
is included in the version of Skia we use, the build fails with modern versions
of Visual Studio Build Tools.

As a temporary workaround, this commit adds the necessary include after Skia checkout.

Sometimes Gradle C++ plugin fails to find Visual Studio Build Tools
automatically (see https://github.com/gradle/gradle-native/issues/617).

This commit adds optional environment variable for providing
VSBT path manually.

Use -Pdeploy.release=true to override

This commit gets rid of bash scripts. Everything is done by Gradle.
Also setting SKIA_DIR became optional:
SKIA_DIR is used, when it is set,
otherwise the binaries are downloaded from bintray
(see gradle.properties for the exact artifact pattern).

This change simplifies building on Windows.

This reverts commit 3ade5832.

Co-authored-by: Alexey Tsvetkov <alexey.tsvetkov@jetbrains.com>

It is useful to have two separate default values: one for local development and one for CI.
This will allow us to advance published version without
touching CI configuration.

They don't work, because they expect gradle/wrapper/gradle-wrapper.jar to exist.
That directory was moved to skiko/ directory.

This mainly affects running tasks from Intellij,
where changing JAVA_HOME can be inconvenient.

In command-line `./gradlew` Gradle JVM is equal to JAVA_HOME by default