remove build_dir functionality - close #65

build_tests/typical/src/one/one.c

@@ -0,0 +1,6 @@
+#include "two.h"
+
+int main(int argc, char *argv[])
+{
+    two();
+}

build_tests/typical/src/two/two.c

@@ -0,0 +1,7 @@
+#include <stdio.h>
+#include "two.h"
+
+void two(void)
+{
+    printf("Hello from two()\n");
+}

build_tests/typical/src/two/two.h

@@ -0,0 +1,6 @@
+#ifndef TWO_H
+#define TWO_H
+
+void two(void);
+
+#endif