GNUmakefile: avoid tabs
diff --git a/GNUmakefile b/GNUmakefile
index 390c4cf..eefba85 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -211,9 +211,9 @@
 endif
 
 ifdef ASAN_BUILD
-	$(info Compiling ASAN version of binaries)
-	CFLAGS+=$(ASAN_CFLAGS)
-	LDFLAGS+=$(ASAN_LDFLAGS)
+        $(info Compiling ASAN version of binaries)
+        CFLAGS+=$(ASAN_CFLAGS)
+        LDFLAGS+=$(ASAN_LDFLAGS)
 endif
 
 ifeq "$(shell echo '$(HASH)include <sys/ipc.h>@$(HASH)include <sys/shm.h>@int main() { int _id = shmget(IPC_PRIVATE, 65536, IPC_CREAT | IPC_EXCL | 0600); shmctl(_id, IPC_RMID, 0); return 0;}' | tr @ '\n' | $(CC) $(CFLAGS) -x c - -o .test2 2>/dev/null && echo 1 || echo 0 ; rm -f .test2 )" "1"