package/mpd: needs gcc >= 6

mpd needs gcc >= 6 since version 0.21 and
https://github.com/MusicPlayerDaemon/MPD/commit/a72d1200fba613d542aa806cbd6c536c0e5061db

Fixes:
 - http://autobuild.buildroot.org/results/dc4/dc49aaae29c61a8edd82e5fbd93db962e1126465

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Acked-by: Jörg Krause <joerg.krause@embedded.rocks>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/mpd/Config.in

@@ -5,7 +5,7 @@ menuconfig BR2_PACKAGE_MPD
 	depends on BR2_TOOLCHAIN_HAS_THREADS
 	depends on BR2_USE_MMU # fork
 	depends on BR2_TOOLCHAIN_HAS_ATOMIC
-	depends on BR2_TOOLCHAIN_GCC_AT_LEAST_4_9 # C++14
+	depends on BR2_TOOLCHAIN_GCC_AT_LEAST_6 # C++14
 	depends on !BR2_TOOLCHAIN_HAS_GCC_BUG_64735 # exception_ptr
 	select BR2_PACKAGE_BOOST
 	select BR2_PACKAGE_LIBICONV if !BR2_ENABLE_LOCALE
@@ -355,11 +355,11 @@ config BR2_PACKAGE_MPD_UPNP
 
 endif
 
-comment "mpd needs a toolchain w/ C++, threads, wchar, gcc >= 4.9"
+comment "mpd needs a toolchain w/ C++, threads, wchar, gcc >= 6"
 	depends on BR2_USE_MMU
 	depends on BR2_TOOLCHAIN_HAS_ATOMIC
 	depends on !BR2_INSTALL_LIBSTDCPP || !BR2_USE_WCHAR || \
-		!BR2_TOOLCHAIN_HAS_THREADS || !BR2_TOOLCHAIN_GCC_AT_LEAST_4_9
+		!BR2_TOOLCHAIN_HAS_THREADS || !BR2_TOOLCHAIN_GCC_AT_LEAST_6
 
 comment "mpd needs a toolchain not affected by GCC bug 64735"
 	depends on BR2_TOOLCHAIN_HAS_GCC_BUG_64735