Ignore exit code on make clean of SQLCipher

When running `make clean` on root of project after initially cloing the
repository, `make clean` will be run in the SQLCipher directory and may
fail. This is safe to ignore.

Author: developernotes

Diff for: android-database-sqlcipher/native.gradle

@@ -88,8 +88,9 @@ task cleanSQLCipher() {
   gitClean("${sqlcipherDir}")
   exec {
     workingDir "${sqlcipherDir}"
+    ignoreExitValue true
     commandLine "make", "clean"
-    }
+  }
   File amalgamationDestinationSource = new File("${nativeRootOutputDir}/cpp/sqlite3.c")
   File amalgamationDestinationHeader = new File("${nativeRootOutputDir}/cpp/sqlite3.h")
   if (amalgamationDestinationSource.exists()) amalgamationDestinationSource.delete()