nginx: do not reduce max processes

Use the upstream value for NGX_MAX_PROCESSES (=1024) again.
So it is safe to use `worker_processes auto;` (which sets it to
the number of CPUs). Also use this directive in the conf instead
of calculating the number in the init and passing it as argument.

Signed-off-by: Peter Stadler <peter.stadler@student.uibk.ac.at>

net/nginx/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=nginx
 PKG_VERSION:=1.17.10
-PKG_RELEASE:=2
+PKG_RELEASE:=3
 
 PKG_SOURCE:=nginx-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=https://nginx.org/download/