Add -static-executable and -latomic

As mentioned in Issue #3.

Author: helje5

scripts/swift-lambda-build

@@ -255,7 +255,7 @@ spmBuild() {
 
   # use static linking for Lambda
   if [[ "x${static}" = "xyes" ]]; then
-    STATIC_LINK_OPT="-Xswiftc -static-stdlib"
+    STATIC_LINK_OPT="-Xswiftc -static-stdlib -Xswiftc -static-executable"
     for static_lib in "${static_libs_a[@]}"; do
       STATIC_LINK_OPT="${STATIC_LINK_OPT} -Xswiftc -l${static_lib}"
     done

scripts/swift-lambda-env

@@ -77,14 +77,13 @@ static=${static:=no}
 if [[ "x${static}" = "xyes" ]]; then
   # linking higher level stuff doesn't work quite right yet
   #static_libs=${static_libs:=CoreFoundation CFXMLInterface FoundationXML icui18nswift icuucswift icudataswift DispatchStubs}
-  static_libs=${static_libs:=icui18nswift icuucswift icudataswift DispatchStubs dispatch}
+  static_libs=${static_libs:=icui18nswift icuucswift icudataswift DispatchStubs dispatch atomic}
   IFS=', ' read -r -a static_libs_a <<< "$static_libs"
 else
   static_libs=
   static_libs_a=()
 fi
 
-
 BUILD_IN_XCODE=no
 if [[ -d "$PWD/Sources" ]]; then
   SRCROOT=${SRCROOT:=$PWD} # CAREFUL - Different Meaning!!!