build: support build/ being a symlink

I use a symlink to keep build artifacts off of my main drive, so
preserve the link if it exists.

Signed-off-by: Ben Boeckel <mathstuf@gmail.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/check b/check
index 708ac0f8..965d507a 100755
--- a/check
+++ b/check
@@ -20,5 +20,5 @@ set -e
 
 python setup.py --quiet clean
 python setup.py --quiet build_ext -i
-rm -rf build
+rm -rf build/*/
 python setup.py --quiet check "$@"