package/qt5: enable for ARC

Double-conversion got pulled-in Qt's sources from the upstream project
quite some time ago [1], so now Qt5 is buildable for ARC perfectly fine.

This reverts the last part of [2],
commit e453fb9e3280 (qt5: disable qt-5.8.0 support for arc, nios2 and xtensa).

[1] https://invent.kde.org/qt/qt/qtbase/-/commit/425df43d7fed19866fc7ceb3d26b6cc4190523f5
[2] https://git.buildroot.net/buildroot/commit/?id=e453fb9e3280a1a1ce6180e165aab9c4f1642555

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Cc: Peter Seiderer <ps.report@gmx.net>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

package/qt5/Config.in

@@ -13,7 +13,6 @@ config BR2_PACKAGE_QT5_JSCORE_AVAILABLE
 
 comment "Qt5 needs host g++ >= 5.0, and a toolchain w/ gcc >= 5.0, wchar, NPTL, C++, dynamic library"
 	depends on !BR2_ARM_CPU_ARMV4
-	depends on !BR2_arc
 	depends on !BR2_INSTALL_LIBSTDCPP || !BR2_USE_WCHAR || \
 		!BR2_TOOLCHAIN_HAS_THREADS_NPTL || BR2_STATIC_LIBS || \
 		!BR2_HOST_GCC_AT_LEAST_5 || !BR2_TOOLCHAIN_GCC_AT_LEAST_5
@@ -26,8 +25,6 @@ menuconfig BR2_PACKAGE_QT5
 	depends on BR2_HOST_GCC_AT_LEAST_5 # Full C++11
 	depends on BR2_TOOLCHAIN_GCC_AT_LEAST_5 # C++11, GCC_BUG_57694
 	depends on !BR2_ARM_CPU_ARMV4 # needs ARMv5+
-	# no built-in double-conversion support
-	depends on !BR2_arc
 	depends on !BR2_STATIC_LIBS
 	select BR2_PACKAGE_QT5BASE
 	help