Drop the ARM Mroonga patch that it is already applied upstream

The author Vicențiu Ciorbaru confirmed this patch can be dropped as it
has already been applied upstream.

debian/patches/armhf_mroonga_storage_fail.patch

-From: Debian MySQL Maintainers <pkg-mysql-maint@lists.alioth.debian.org>
-Date: Thu, 10 Aug 2017 20:40:29 +0200
-Subject: armhf_mroonga_storage_fail
-
----
- storage/mroonga/lib/mrn_multiple_column_key_codec.cpp | 3 ++-
- 1 file changed, 2 insertions(+), 1 deletion(-)
-
---- a/storage/mroonga/lib/mrn_multiple_column_key_codec.cpp
-+++ b/storage/mroonga/lib/mrn_multiple_column_key_codec.cpp
-@@ -623,9 +623,10 @@ namespace mrn {
-     long long int long_long_value;
-     mrn_byte_order_network_to_host(&long_long_value, grn_key, grn_key_size);
-     int max_bit = (grn_key_size * 8 - 1);
--    *((long long int *)mysql_key) =
-+    long_long_value =
-       long_long_value ^ (((long_long_value ^ (1LL << max_bit)) >> max_bit) |
-                          (1LL << max_bit));
-+    memcpy(mysql_key, &long_long_value, sizeof(long_long_value));
-     DBUG_VOID_RETURN;
-   }
- 

debian/patches/series

@@ -4,7 +4,6 @@ innodb_simulate_comp_test_speedup.patch
 mips-groonga-atomic.patch
 mips-connect-unaligned.patch
 mips-machine.patch
-#armhf_mroonga_storage_fail.patch
 c11_atomics.patch
 kFreeBSD-gettid.patch
 mytop-merge_src:mytop_improvements.patch