libc/uClibc: add patch to fix fork in threads with ARM EABI

uClibc-0.9.32 requires libgcc_eh.a (for ARM EABI), but only when libubacktrace
is enabled. As this is not the default, provide a workaround to disable linking
with libgcc_eh.a if libubacktrace is not selected.

This will however still break if uClibc is configured to enable libubacktrace,
but it requires a fix in gcc, and we can take care of that later.

Reported-by: Grant Edwards <grant.b.edwards@gmail.com>
Reported-by: Tor Krill <tor@codeknot.com>
Tested-by: Tor Krill <tor@codeknot.com>
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>

patches/uClibc/0.9.32/170-Conditionalize-use-libgcc_eh-when-libubacktrace-is-n.patch

@@ -0,0 +1,29 @@
+From the uClibc ML archives:
+    http://lists.uclibc.org/pipermail/uclibc/2011-June/045411.html
+
+>From 364a3a9c576d604bed146efe0b8b33d2b81d4c64 Mon Sep 17 00:00:00 2001
+From: Jason Woodward <jason.woodward@timesys.com>
+Date: Sat, 11 Jun 2011 01:08:48 -0400
+Subject: [PATCH 1/3] Conditionalize use libgcc_eh when libubacktrace is not enabled
+
+Signed-off-by: Jason Woodward <jason.woodward@timesys.com>
+---
+ libubacktrace/Makefile.in |    2 +-
+ 1 files changed, 1 insertions(+), 1 deletions(-)
+
+diff --git a/libubacktrace/Makefile.in b/libubacktrace/Makefile.in
+index f75f68b..880a8af 100644
+--- a/libubacktrace/Makefile.in
++++ b/libubacktrace/Makefile.in
+@@ -12,7 +12,7 @@ CFLAGS-libubacktrace := -DNOT_IN_libc -DIS_IN_libubacktrace $(SSP_ALL_CFLAGS)
+ 
+ LDFLAGS-libubacktrace.so := $(LDFLAGS) $(top_builddir)lib/libdl-$(VERSION).so
+ 
+-ifeq ($(CONFIG_ARM_EABI),y)
++ifeq ($(UCLIBC_HAS_BACKTRACE)$(CONFIG_ARM_EABI),yy)
+ LIBGCC += $(shell $(CC) -print-file-name=libgcc_eh.a)
+ endif
+ 
+-- 
+1.7.0.4
+