Bump buildroot to 2019.02

bsp/buildroot/package/libgcrypt/0001-ac_cv_sys_symbol_underscore.patch

@@ -1,27 +0,0 @@
-diff --git a/acinclude.m4 b/acinclude.m4
-index a7bc0fa..1a5bffc 100644
---- a/acinclude.m4
-+++ b/acinclude.m4
-@@ -76,13 +76,14 @@ case "${host}" in
-     i386-emx-os2 | i[3456]86-pc-os2*emx | i386-pc-msdosdjgpp)
-         ac_cv_sys_symbol_underscore=yes
-         ;;
--    *)
--      if test "$cross_compiling" = yes; then
--        if test "x$ac_cv_sys_symbol_underscore" = x ; then
--           ac_cv_sys_symbol_underscore=yes
--        fi
--      else
--         tmp_do_check="yes"
-+    *) if test -z "$ac_cv_sys_symbol_underscore"; then
-+         if test "$cross_compiling" = yes; then
-+           if test "x$ac_cv_sys_symbol_underscore" = x ; then
-+              ac_cv_sys_symbol_underscore=yes
-+           fi
-+         else
-+            tmp_do_check="yes"
-+         fi
-       fi
-        ;;
- esac
- 

bsp/buildroot/package/libgcrypt/libgcrypt.hash

@@ -1,6 +1,7 @@
-# From https://lists.gnupg.org/pipermail/gnupg-announce/2018q2/000426.html
-sha1 13bd2ce69e59ab538e959911dfae80ea309636e3  libgcrypt-1.8.3.tar.bz2
+# From https://lists.gnupg.org/pipermail/gnupg-announce/2018q4/000431.html
+sha1 4a8ef9db6922f3a31992aca5640b4198a69b58fc  libgcrypt-1.8.4.tar.bz2
 # Locally calculated after checking signature
-# https://gnupg.org/ftp/gcrypt/libgcrypt/libgcrypt-1.8.3.tar.bz2.sig
-sha256  66ec90be036747602f2b48f98312361a9180c97c68a690a5f376fa0f67d0af7c  libgcrypt-1.8.3.tar.bz2
+# https://gnupg.org/ftp/gcrypt/libgcrypt/libgcrypt-1.8.4.tar.bz2.sig
+# using key D8692123C4065DEA5E0F3AB5249B39D24F25E3B6
+sha256  f638143a0672628fde0cad745e9b14deb85dffb175709cacc1f4fe24b93f2227  libgcrypt-1.8.4.tar.bz2
 sha256  ca0061fc1381a3ab242310e4b3f56389f28e3d460eb2fd822ed7a21c6f030532  COPYING.LIB

bsp/buildroot/package/libgcrypt/libgcrypt.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-LIBGCRYPT_VERSION = 1.8.3
+LIBGCRYPT_VERSION = 1.8.4
 LIBGCRYPT_SOURCE = libgcrypt-$(LIBGCRYPT_VERSION).tar.bz2
 LIBGCRYPT_LICENSE = LGPL-2.1+
 LIBGCRYPT_LICENSE_FILES = COPYING.LIB