Update copy_files blackbox test to include C

Tests that the the directive emits #line instead of #n.

Signed-off-by: David Allsopp <david.allsopp@metastack.com>

test/blackbox-tests/test-cases/copy_files/bar.c

@@ -0,0 +1 @@
+#include "bar.h"

test/blackbox-tests/test-cases/copy_files/include/bar.h

@@ -0,0 +1 @@
+int foo () {return 42;}

test/blackbox-tests/test-cases/copy_files/jbuild

@@ -1,6 +1,14 @@
 (jbuild_version 1)
 
 (copy_files# lexers/*.ml{,i})
+(copy_files# include/bar.h)
 
-(executables
- ((names (test))))
+(library
+ ((name foo)
+  (c_names (bar))
+  (modules ())
+  (wrapped false)))
+
+(executable
+ ((name test)
+  (libraries (foo))))

test/blackbox-tests/test-cases/copy_files/run.t

@@ -1,8 +1,12 @@
   $ $JBUILDER build -j1 test.exe .merlin --root . --debug-dependency-path
       ocamllex lexers/lexer1.ml
       ocamldep test.depends.ocamldep-output
+      ocamldep foo.depends.ocamldep-output
         ocamlc lexer1.{cmi,cmo,cmt}
+        ocamlc bar.o
+      ocamlopt foo.{a,cmxa}
       ocamlopt lexer1.{cmx,o}
         ocamlc test.{cmi,cmo,cmt}
+    ocamlmklib dllfoo_stubs.so,libfoo_stubs.a
       ocamlopt test.{cmx,o}
       ocamlopt test.exe