rename from chat/nss-purple.def
rename to chat/nss-purple.symbols

--- a/im/confvars.sh
+++ b/im/confvars.sh
@@ -19,11 +19,9 @@ MOZ_APP_VERSION_TXT=${_topsrcdir}/$MOZ_B
 MOZ_APP_VERSION=`cat $MOZ_APP_VERSION_TXT`
 INSTANTBIRD_VERSION=$MOZ_APP_VERSION
 
 MOZ_BRANDING_DIRECTORY=im/branding/nightly
 MOZ_OFFICIAL_BRANDING_DIRECTORY=other-licenses/branding/instantbird
 MOZ_APP_ID={33cb9019-c295-46dd-be21-8c4936574bee}
 # Enable generational GC on desktop.
 JSGC_GENERATIONAL=1
-if test "$OS_TARGET" = "WINNT"; then
-  NSS_EXTRA_SYMBOLS_FILE=../../../../chat/nss-purple.def
-fi
+NSS_EXTRA_SYMBOLS_FILE=../../../../chat/nss-purple.symbols