libmaxminddb: update to 1.6.0.

## 1.6.0 - 2021-04-29

* This release includes several improvements to the CMake build. In
  particular:
  * C99 support is now properly enabled, fixing builds on older `gcc`
    versions. Pull request by Jan Vcelak. GitHub #257.
  * `CMAKE_SHARED_LIBRARY_PREFIX` and `CMAKE_STATIC_LIBRARY_PREFIX` are
    no longer explicitly set and now use the default values for the platform.
    Pull request by Jan Vcelak. GitHub #258.
  * `target_include_directories` now works as expected. Pull request by Jan
    Vcelak. GitHub #259.
  * DLLs are now installed on Windows when `libmaxminddb` is built as a
    shared library. Pull request by Jan Vcelak. GitHub #261.
  * When built as a dynamic library on Windows, all symbols are now exported.
    Pull request by Jan Vcelak. GitHub #262.

geography/libmaxminddb/Makefile

@@ -1,6 +1,6 @@
-# $NetBSD: Makefile,v 1.5 2021/02/19 08:16:37 fcambus Exp $
+# $NetBSD: Makefile,v 1.6 2021/05/01 16:08:45 fcambus Exp $
 
-DISTNAME=	libmaxminddb-1.5.2
+DISTNAME=	libmaxminddb-1.6.0
 CATEGORIES=	geography
 MASTER_SITES=	${MASTER_SITE_GITHUB:=maxmind/}
 GITHUB_RELEASE=	${PKGVERSION_NOREV}

geography/libmaxminddb/distinfo

@@ -1,7 +1,7 @@
-$NetBSD: distinfo,v 1.5 2021/02/19 08:16:37 fcambus Exp $
+$NetBSD: distinfo,v 1.6 2021/05/01 16:08:45 fcambus Exp $
 
-SHA1 (libmaxminddb-1.5.2.tar.gz) = 9e00fef11ceb8df1dc56ce3276bf2193c5baa5c8
-RMD160 (libmaxminddb-1.5.2.tar.gz) = 183c003b20dbfbebd6815e45660157f852fa0c70
-SHA512 (libmaxminddb-1.5.2.tar.gz) = 074ef6b62a74cede7be332eaeff5aa7442f43de92d39ea65b38430f0e1b65a5515f4343894ca5c28a7d50181eaec44e8db7083461b9e12e7014d2d1e0ff033b8
-Size (libmaxminddb-1.5.2.tar.gz) = 604683 bytes
+SHA1 (libmaxminddb-1.6.0.tar.gz) = 4d7f2a2b5050752977b3e718fd96b359da744a9e
+RMD160 (libmaxminddb-1.6.0.tar.gz) = 85fe2385d5811a4fbe4ab5e6cb1cfff243daefca
+SHA512 (libmaxminddb-1.6.0.tar.gz) = 9394e8dd959982d4ef5d15a928d32700722ed9d6c9988d9cc1bf2f4e67de0a53cc6987e90aaef3a6926c9ff36ac378f7a1fe47818fda4f5a3a22539210b2d004
+Size (libmaxminddb-1.6.0.tar.gz) = 605099 bytes
 SHA1 (patch-t_libtap_tap.c) = 85cefd897f2eade00a0c9e9b2cf5e0ca7c7c9337