revert2

Author: krichprollsch

build-tools/utils.sh

@@ -23,13 +23,8 @@ case $(uname -m) in
   *)      fail "unsupported architecture: $(uname -m)"
 esac
 
-: "${OS:=unset}"
-case "$OS" in
-  unset)
-    case "$OSTYPE" in
-      darwin*)  OS="mac" ;;
-      linux*)   OS="linux" ;;
-      *)        fail "unsupported platform: ${OSTYPE}"
-    esac
-    ;;
-esac
+case "$OSTYPE" in
+  darwin*)  OS="mac" ;;
+  linux*)   OS="linux" ;;
+  *)        fail "unsupported platform: ${OSTYPE}"
+esac