Revert "use true names for executables"

This reverts commit e50d1c4
See https://issuetracker.google.com/issues/152645643 for discussion: this is not supposed to work, wrap.sh is a special well-known name. Also, older devices (e.g. API 24) don't install files from libs directory if they don't match the expected "lib.*\.so" pattern.

android-ffmpeg/src/main/java/nl/bravobit/ffmpeg/FileUtils.java

@@ -5,8 +5,8 @@
 import java.io.File;
 
 class FileUtils {
-    private static final String FFMPEG_FILE_NAME = "ffmpeg";
-    private static final String FFPROBE_FILE_NAME = "ffprobe";
+    private static final String FFMPEG_FILE_NAME = "lib..ffmpeg..so";
+    private static final String FFPROBE_FILE_NAME = "lib..ffprobe.so";
 
     static File getFFmpeg(Context context) {
         File folder = new File(context.getApplicationInfo().nativeLibraryDir);