aviary landing fallout correction: add xpcom_core.dll/libxpcom_core.so to packager lists

browser/installer/unix/packages-static

@@ -33,6 +33,7 @@ bin/libmozjs.so
 bin/libplc4.so
 bin/libplds4.so
 bin/libxpcom.so
+bin/libxpcom_core.so
 bin/libxpistub.so
 bin/libnspr4.so
 bin/components/libxpinstall.so

browser/installer/windows/packages-static

@@ -33,6 +33,7 @@ bin\js3250.dll
 bin\plc4.dll
 bin\plds4.dll
 bin\xpcom.dll
+bin\xpcom_core.dll
 bin\xpistub.dll
 bin\nspr4.dll
 bin\components\xpinstal.dll