test: Always create unique tmpdirs

This ensures our tests always have clear temporary directories to store
their files.

Change-Id: Ib755c4a9407b1e1925b34ae1537eb234542133b0
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/subprojects/stdplus.wrap b/subprojects/stdplus.wrap
index 765ba71..d49e9a1 100644
--- a/subprojects/stdplus.wrap
+++ b/subprojects/stdplus.wrap
@@ -4,3 +4,5 @@
 
 [provide]
 stdplus = stdplus_dep
+stdplus-gtest = stdplus_gtest_dep
+program_names = run_with_tmp