Fix build against glibc 2.21

* Makeconf (CPPFLAGS): Remove -D_IO_MTSAFE_IO.
* libthreads/lockfile.c (_IO_MTSAFE_IO): Define macro.
(IS_IN): Define macro to 0.

1 files changed, 1 insertions, 1 deletions

diff --git a/Makeconf b/Makeconf
index ed2f6d0a..b42e4c79 100644
--- a/Makeconf
+++ b/Makeconf
@@ -77,7 +77,7 @@ INCLUDES += -I.. $(top_srcdirinc)
 endif
 INCLUDES += -I$(..)include -I$(top_srcdir)/include
 CPPFLAGS += $(INCLUDES) \
-	     -D_GNU_SOURCE -D_IO_MTSAFE_IO -D_FILE_OFFSET_BITS=64 \
+	     -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 \
 	    $($*-CPPFLAGS)
 CFLAGS += -std=gnu99 $(gnu89-inline-CFLAGS) -Wall -g -O3 \
 	    $($*-CFLAGS)