compareToAscii(RTL_CONSTASCII_STRINGPARAM(s)) != compareToAscii(s)

...broken with 2cbdaf67 "package: no more
RTL_CONSTASCII_USTRINGPARAM in zippackage"

(cherry picked from commit 29c49b37)
Conflicts:
	package/source/zippackage/ZipPackage.cxx

Change-Id: I867b9be723d1fde374ade68355e6b66df3c19332
Reviewed-on: https://gerrit.libreoffice.org/2760Reviewed-by: Luboš Luňák <l.lunak@suse.cz>
Tested-by: Luboš Luňák <l.lunak@suse.cz>

package/source/zippackage/ZipPackage.cxx

@@ -385,7 +385,7 @@ void ZipPackage::parseManifest()
             if ( !bManifestParsed )
             {
                 // the manifest.xml could not be successfuly parsed, this is an inconsistent package
-                if ( aPackageMediatype.compareToAscii("application/vnd.") == 0 )
+                if ( aPackageMediatype.startsWith("application/vnd.") )
                 {
                     // accept only types that look similar to own mediatypes
                     m_pRootFolder->SetMediaType( aPackageMediatype );