libftdi: add dependency on atomic operations

This fixes:
http://autobuild.buildroot.net/results/6cb25ed954840109c9d0e582e922b0ba9d07e174/

Signed-off-by: Anton Kolesov <Anton.Kolesov@synopsys.com>
[yann.morin.1998@free.fr: use the new symbol; remove comment strings]
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/libftdi/Config.in

@@ -1,6 +1,7 @@
 config BR2_PACKAGE_LIBFTDI
 	bool "libftdi"
 	depends on BR2_TOOLCHAIN_HAS_THREADS # libusb
+	depends on BR2_ARCH_HAS_ATOMICS
 	select BR2_PACKAGE_LIBUSB
 	select BR2_PACKAGE_LIBUSB_COMPAT
 	help
@@ -19,4 +20,5 @@ config BR2_PACKAGE_LIBTFDI_CPP
 endif # BR2_PACKAGE_LIBFTDI
 
 comment "libftdi needs a toolchain w/ threads"
+	depends on BR2_ARCH_HAS_ATOMICS
 	depends on !BR2_TOOLCHAIN_HAS_THREADS

package/openocd/Config.in

@@ -14,6 +14,7 @@ comment "Adapters"
 
 config BR2_PACKAGE_OPENOCD_FT2XXX
 	bool "FT2xxx/FT4xxx Based JTAG Programmer"
+	depends on BR2_ARCH_HAS_ATOMICS # libftdi
 	select BR2_PACKAGE_LIBFTDI
 	help
 	  Enable building support for FT2232 based devices