Add a test for getting the path of a found program

test cases/common/105 find program path/meson.build

@@ -0,0 +1,11 @@
+project('find program', 'c')
+
+prog = find_program('program.py')
+
+# Use either Python3 or 2 to run this
+python = find_program('python3', required : false)
+if not python.found()
+  python = find_program('python')
+endif
+
+run_command(python, prog.path())

test cases/common/105 find program path/program.py

@@ -0,0 +1,3 @@
+#!/usr/bin/env python3
+
+print("Found")