zabbix: remove configure patch

Allows removing autoreconf.

Added PKG_BUILD_PARALLEL for faster compilation.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

admin/zabbix/patches/100-musl-compat.patch

@@ -1,11 +0,0 @@
---- a/configure.ac
-+++ b/configure.ac
-@@ -51,7 +51,7 @@ AC_CHECK_HEADERS(stdio.h stdlib.h string
-   syslog.h time.h errno.h sys/types.h sys/stat.h netinet/in.h \
-   math.h sys/socket.h dirent.h ctype.h \
-   mtent.h fcntl.h sys/param.h arpa/inet.h \
--  sys/vfs.h sys/pstat.h sys/sysinfo.h sys/statvfs.h sys/statfs.h \
-+  sys/vfs.h sys/pstat.h sys/statvfs.h sys/statfs.h \
-   sys/socket.h sys/loadavg.h arpa/inet.h \
-   sys/vmmeter.h strings.h vm/vm_param.h \
-   sys/time.h kstat.h sys/syscall.h sys/sysmacros.h \