package/bitcoin: needs wchar

wchar is used in src/tinyformat.h and is a reverse dependency of boost

Fixes:
 - No autobuilder failure (as package can't be enabled yet)

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/bitcoin/Config.in

@@ -12,6 +12,7 @@ config BR2_PACKAGE_BITCOIN
 	depends on BR2_INSTALL_LIBSTDCPP
 	depends on !BR2_TOOLCHAIN_HAS_GCC_BUG_64735 # std::future
 	depends on BR2_PACKAGE_BITCOIN_ARCH_SUPPORTS
+	depends on BR2_USE_WCHAR
 	select BR2_PACKAGE_BOOST
 	select BR2_PACKAGE_BOOST_SYSTEM
 	select BR2_PACKAGE_BOOST_FILESYSTEM
@@ -36,9 +37,9 @@ config BR2_PACKAGE_BITCOIN
 
 	  https://bitcoincore.org
 
-comment "bitcoin needs a toolchain w/ C++"
+comment "bitcoin needs a toolchain w/ C++, wchar"
 	depends on BR2_PACKAGE_BITCOIN_ARCH_SUPPORTS
-	depends on !BR2_INSTALL_LIBSTDCPP
+	depends on !BR2_INSTALL_LIBSTDCPP || !BR2_USE_WCHAR
 
 comment "bitcoin needs a toolchain not affected by GCC bug 64735"
 	depends on BR2_PACKAGE_BITCOIN_ARCH_SUPPORTS