Remove dependency of old support library

[nordfalk]

Remove dependency of old support library
This will enable people to remove use of Android Jetifier - see https://github.com/dipien/bye-bye-jetifier

[nordfalk]

If others have the same need Ive published an artifact on jitpack. See https://jitpack.io/#DineroRegnskab/PdfiumAndroid/pdfium-android-1.9.2

allprojects {
    repositories {
        google()
        jcenter()
        **maven { url 'https://jitpack.io' }**
    }
}

Note: You muse use 'api' instead of 'implementation'.

**api** 'com.github.DineroRegnskab:PdfiumAndroid:pdfium-android-1.9.2'

[johngray1965]

I wrote a new version: https://github.com/johngray1965/PdfiumAndroidKt
its free of the old dependencies. And it's being actively maintained.