mariadb: Include missing sys/type.h for ssize_t

musl finds this problem in sources where its missing to include
needed system header for ssize_t

Fixes
wsrep-lib/include/wsrep/gtid.hpp:80:5: error: unknown type name 'ssize_t'; did you mean 'size_t'?
    ssize_t scan_from_c_str(const char* buf, size_t buf_len,
    ^~~~~~~
    size_t

Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-oe/recipes-dbs/mysql/mariadb.inc

@@ -22,6 +22,7 @@ SRC_URI = "https://downloads.mariadb.org/interstitial/${BP}/source/${BP}.tar.gz
            file://0001-aio_linux-Check-if-syscall-exists-before-using-it.patch \
            file://sys_futex.patch \
            file://cross-compiling.patch \
+           file://ssize_t.patch \
           "
 SRC_URI_append_libc-musl = " file://ppc-remove-glibc-dep.patch"
 

meta-oe/recipes-dbs/mysql/mariadb/ssize_t.patch

@@ -0,0 +1,15 @@
+ssize_t comes from sys/types.h therefore include it
+
+Upstream-Status: Pending
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+--- a/wsrep-lib/include/wsrep/gtid.hpp
++++ b/wsrep-lib/include/wsrep/gtid.hpp
+@@ -25,7 +25,7 @@
+ #include "compiler.hpp"
+ 
+ #include <iosfwd>
+-
++#include <sys/types.h>
+ /**
+  * Minimum number of bytes guaratneed to store GTID string representation,
+  * terminating '\0' not included (36 + 1 + 20).