libcc1: return absolute filename from make search_dir

for  libcc1/ChangeLog

	* findcomp.cc: Include system.h.
	(search_dir): Return absolute filename.

From-SVN: r245050

libcc1/ChangeLog

 2017-01-30  Jan Kratochvil <jan.kratochvil@redhat.com>
 
+	* findcomp.cc: Include system.h.
+	(search_dir): Return absolute filename.
+
 	* libcc1.cc (libcc1): Add class compiler with field compilerp,
 	class compiler_triplet_regexp and class
 	compiler_driver_filename.

libcc1/findcomp.cc

@@ -25,6 +25,7 @@ along with GCC; see the file COPYING3.  If not see
 #include "libiberty.h"
 #include "xregex.h"
 #include "findcomp.hh"
+#include "system.h"
 
 class scanner
 {
@@ -68,7 +69,7 @@ search_dir (const regex_t &regexp, const std::string &dir, std::string *result)
     {
       if (regexec (&regexp, filename, 0, NULL, 0) == 0)
 	{
-	  *result = filename;
+	  *result = dir + DIR_SEPARATOR + filename;
 	  return true;
 	}
     }