unittest: Remove tmp directory from repository and create it during build

This fixes out of tree builds.

Signed-off-by: Stefan Weil <sw@weilnetz.de>

Author: stweil

unittest/Makefile.am

@@ -155,6 +155,13 @@ endif
 
 TESTS = $(check_PROGRAMS)
 
+.PHONY: all
+
+all: tmp
+
+tmp:
+	mkdir -p tmp
+
 # List of source files needed to build the executable:
 
 apiexample_test_SOURCES = apiexample_test.cc