workaround for OpenBSD

Signed-off-by: R4SAS <r4sas@i2pmail.org>

linux/build/build

@@ -16,6 +16,10 @@ version="78.11.0esr"
 application="firefox"
 ftpmirror="https://ftp.mozilla.org/pub/$application/releases/$version"
 
+if [ "$arch" == "amd64" ]; then # OpenBSD (and maybe FreeBSD) returns amd64 as architecture instead x86_64
+	arch=x86_64
+fi
+
 curlfind=$(which curl)
 if [ -z $curlfind ]; then
 	echo "'cURL' does not seem to be installed. The script needs it!"