python3: use ATOMIC64_DEPENDS

libatomic is only needed where the compiler does not inline 64-bit
atomics, but the package depends on it on every target.
ATOMIC64_DEPENDS restricts the dependency to those targets.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

lang/python/python3/Makefile

@@ -11,7 +11,7 @@ include $(TOPDIR)/rules.mk
 include ../python3-version.mk
 
 PKG_NAME:=python3
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 PKG_VERSION:=$(PYTHON3_VERSION).$(PYTHON3_VERSION_MICRO)
 
 PKG_SOURCE:=Python-$(PKG_VERSION).tar.xz
@@ -70,7 +70,7 @@ endef
 define Package/libpython3
 $(call Package/python3/Default)
   TITLE+= core library
-  DEPENDS:=+libpthread +libatomic
+  DEPENDS:=+libpthread $(ATOMIC64_DEPENDS)
   ABI_VERSION:=$(PYTHON3_VERSION)
 endef