mariadb: force disable AUTH_PAM plugin

PAM is not available (and even not usable) in Termux.

packages/mariadb/cmake-build_configurations-mysql_release.cmake.patch

@@ -0,0 +1,12 @@
+diff -uNr mariadb-10.4.8/cmake/build_configurations/mysql_release.cmake mariadb-10.4.8.mod/cmake/build_configurations/mysql_release.cmake
+--- mariadb-10.4.8/cmake/build_configurations/mysql_release.cmake	2019-09-09 00:02:29.000000000 +0300
++++ mariadb-10.4.8.mod/cmake/build_configurations/mysql_release.cmake	2019-09-18 16:39:38.173014925 +0300
+@@ -124,7 +124,7 @@
+ 
+ IF(UNIX)
+   SET(WITH_EXTRA_CHARSETS all CACHE STRING "")
+-  SET(PLUGIN_AUTH_PAM YES)
++  SET(PLUGIN_AUTH_PAM NO)
+ 
+   IF(CMAKE_SYSTEM_NAME STREQUAL "Linux")
+     IF(NOT IGNORE_AIO_CHECK)