gdb: gdbserver package dependency fix (#11179)

In the current trunk, gdbserver is not building anymore (with EGLIBC 2.15
selected) due to a missing dependency:
Package gdbserver is missing dependencies for the following libraries:
libthread_db.so.1

In order to fix it, the system shared lib libthread_db.so.1 is copied from
the toolchain lib dir into the gdb package target structure (/usr/lib) to
pass the dependency checks.
This patch was (quickly) reviewed by Paul Fertser on IRC.

Signed-off-by: xxiao <xxiao@fosiao.com>
Signed-off-by: Matthieu Boujonnier <openwrt-devel@metaverse.fr>

SVN-Revision: 33479

package/gdb/Makefile

@@ -77,6 +77,10 @@ endef
 define Package/gdbserver/install
 	$(INSTALL_DIR) $(1)/usr/bin
 	$(INSTALL_BIN) $(PKG_INSTALL_DIR)/usr/bin/gdbserver $(1)/usr/bin/
+ifneq ($(CONFIG_USE_EGLIBC),)
+	$(INSTALL_DIR) $(1)/usr/lib
+	$(CP) $(TOOLCHAIN_DIR)/lib/libthread_db* $(1)/usr/lib
+endif
 endef
 
 $(eval $(call BuildPackage,gdb))