Add libatomic1 when building on linux/386.

Author: sobomax

scripts/build/get-arch-buildargs.sh

@@ -1,6 +1,7 @@
 #!/bin/sh
 
 set -e
+set -x
 
 platformopts() {
   out=""
@@ -11,6 +12,14 @@ platformopts() {
       echo "QEMU_CPU=cortex-a53"
       ;;
     esac
+    ;;
+  debian:*)
+    case "${TARGETPLATFORM}" in
+    linux/386)
+      echo "LIB_DEPS=${LIB_DEPS} libatomic1"
+      ;;
+    esac
+    ;;
   esac
 }