libubacktrace: Conditionally link libgcc_eh

When libubacktrace is not enabled there is no need to link in libgcc_eh
Fixes bootstrap failures with (gcc-4.5.x) stage1 compilers that --disable-shared

Signed-off-by: Jason Woodward <jason.woodward@timesys.com>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>

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