Don't create broken symlink in libstdc++-v3/include/bits

	* include/Makefile.am (stamp-bits-sup): Do not create broken symlink
	to stamp-bits.
	* include/Makefile.in: Regenerate.

From-SVN: r254229

libstdc++-v3/ChangeLog

 2017-10-30  Jonathan Wakely  <jwakely@redhat.com>
 
+	* include/Makefile.am (stamp-bits-sup): Do not create broken symlink
+	to stamp-bits.
+	* include/Makefile.in: Regenerate.
+
 	* include/std/fstream (basic_ifstream, basic_ofstream, basic_fstream):
 	Remove outdated comments about calling c_str() to create a file stream
 	from a std::string.

libstdc++-v3/include/Makefile.am

@@ -1031,7 +1031,7 @@ stamp-bits: ${bits_headers}
 	@$(STAMP) stamp-bits
 
 stamp-bits-sup: stamp-bits ${bits_sup_headers}
-	@-cd ${bits_builddir} && $(LN_S) $? . 2>/dev/null
+	@-cd ${bits_builddir} && $(LN_S) ${bits_sup_headers} . 2>/dev/null
 	@$(STAMP) stamp-bits-sup
 
 stamp-c_base: ${c_base_headers}

libstdc++-v3/include/Makefile.in

@@ -1480,7 +1480,7 @@ stamp-bits: ${bits_headers}
 	@$(STAMP) stamp-bits
 
 stamp-bits-sup: stamp-bits ${bits_sup_headers}
-	@-cd ${bits_builddir} && $(LN_S) $? . 2>/dev/null
+	@-cd ${bits_builddir} && $(LN_S) ${bits_sup_headers} . 2>/dev/null
 	@$(STAMP) stamp-bits-sup
 
 stamp-c_base: ${c_base_headers}