package/mtools: select BR2_TOOLCHAIN_GLIBC_GCONV_LIBS_COPY

Fixes:
 - https://bugs.buildroot.org/show_bug.cgi?id=12986

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
(cherry picked from commit ac4a61e0eac8b6b11389727595d35fd31ffb144e)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/mtools/Config.in

@@ -2,6 +2,8 @@ config BR2_PACKAGE_MTOOLS
 	bool "mtools"
 	depends on BR2_USE_WCHAR
 	depends on BR2_USE_MMU # fork()
+	# runtime UTF conversion support
+	select BR2_TOOLCHAIN_GLIBC_GCONV_LIBS_COPY if BR2_TOOLCHAIN_USES_GLIBC
 	help
 	  Mtools is a collection of utilities to access MS-DOS disks
 	  from Unix without mounting them. It supports Win'95 style