[PATCH] [SHELL] Fix klibc DEBUG compilation v3

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dash didn't compile in DEBUG mode against klibc for all long time.
Now it only fails at link stage for not having setlinebuf(3) and
freopen(3).

Fixes:

usr/dash/show.o: In function `opentrace':
show.c:(.text+0x36): undefined reference to `freopen'
show.c:(.text+0x86): undefined reference to `setlinebuf'

Skip setlinebuf and use fclose/fopen inside __KLIBC__
Compile tested with debug in klibc and against glibc in dash repo.

Signed-off-by: maximilian attems <max@xxxxxxx>
---
 src/show.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/src/show.c b/src/show.c
index 14dbef3..4a049e9 100644
--- a/src/show.c
+++ b/src/show.c
@@ -378,7 +378,11 @@ opentrace(void)
 	scopy("./trace", s);
 #endif /* not_this_way */
 	if (tracefile) {
+#ifndef __KLIBC__
 		if (!freopen(s, "a", tracefile)) {
+#else
+		if (!(!fclose(tracefile) && (tracefile = fopen(s, "a")))) {
+#endif /* __KLIBC__ */
 			fprintf(stderr, "Can't re-open %s\n", s);
 			debug = 0;
 			return;
@@ -394,7 +398,9 @@ opentrace(void)
 	if ((flags = fcntl(fileno(tracefile), F_GETFL, 0)) >= 0)
 		fcntl(fileno(tracefile), F_SETFL, flags | O_APPEND);
 #endif
+#ifndef __KLIBC__
 	setlinebuf(tracefile);
+#endif /* __KLIBC__ */
 	fputs("\nTracing started.\n", tracefile);
 }
 #endif /* DEBUG */
-- 
1.7.5.4

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