gping: drop package

Reasons to drop:
- an unresolved issue which prevents updating gping to latest version.
  gping now relies on support for fractional timespan of 'sleep', which
  isn't enabled in main OpenWrt repository
- there are probably only few users of this package, if any, and I'm not
  a user anymore either
- there are other equal or better tools for the same purpose

Signed-off-by: Jonas Jelonek <jelonek.jonas@gmail.com>

net/gping/Makefile

@@ -1,43 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0-only
-#
-# Copyright (C) 2024 Jonas Jelonek
-
-include $(TOPDIR)/rules.mk
-
-PKG_NAME:=gping
-PKG_VERSION:=1.18.0
-PKG_RELEASE:=1
-
-PKG_SOURCE:=$(PKG_NAME)-v$(PKG_VERSION).tar.gz
-PKG_SOURCE_URL:=https://codeload.github.com/orf/gping/tar.gz/$(PKG_NAME)-v$(PKG_VERSION)?
-PKG_HASH:=a76e09619831c0f2bb95f505a92c1332de89c3c43383b4d832a69afcb0fafd4c
-
-PKG_MAINTAINER:=Jonas Jelonek <jelonek.jonas@gmail.com>
-PKG_LICENSE:=MIT
-PKG_LICENSE_FILES:=LICENSE
-
-PKG_BUILD_DIR:=$(BUILD_DIR)/$(PKG_NAME)-$(PKG_NAME)-v$(PKG_VERSION)
-PKG_BUILD_DEPENDS:=rust/host
-PKG_BUILD_PARALLEL:=1
-
-include $(INCLUDE_DIR)/package.mk
-include ../../lang/rust/rust-package.mk
-
-define Package/gping
-  SECTION:=net
-  CATEGORY:=Network
-  TITLE:=Ping but with a graph
-  DEPENDS:=$(RUST_ARCH_DEPENDS)
-  URL:=https://github.com/orf/gping
-endef
-
-define Package/gping/description
-  gping graphically plots ping results over time in terminal, allows
-  multiple hosts to ping in parallel, uses coloured output and can
-  also plot the execution time of arbitrary commands.
-endef
-
-Build/Compile = $(call Build/Compile/Cargo,gping)
-
-$(eval $(call RustBinPackage,gping))
-$(eval $(call BuildPackage,gping))