add flag tests

let's start with the easy targets from coverage reports

tests/Makefile.am

@@ -35,7 +35,8 @@ src_TESTS = \
   endianness.sh \
   contiguous-note-sections.sh \
   no-gnu-hash.sh \
-  no-dynamic-section.sh
+  no-dynamic-section.sh \
+  basic-flags.sh
 
 build_TESTS = \
   $(no_rpath_arch_TESTS)

tests/basic-flags.sh

@@ -0,0 +1,6 @@
+#! /bin/sh -e
+
+set -x
+../src/patchelf --version | grep -q patchelf
+../src/patchelf --help 2>&1 | grep -q patchelf
+../src/patchelf 2>&1 | grep -q patchelf