This removes lines that set PKG_BUILD_DIR when the set value is no
different from the default value.
Specifically, the line is removed if the assigned value is:
* $(BUILD_DIR)/$(PKG_NAME)-$(BUILD_VARIANT)/$(PKG_NAME)-$(PKG_VERSION)
The default PKG_BUILD_DIR was updated[1] to incorporate BUILD_VARIANT
if it is set, so now this is identical to the default value.
* $(BUILD_DIR)/$(PKG_NAME)-$(BUILD_VARIANT)/$(PKG_SOURCE_SUBDIR)
if PKG_SOURCE_SUBDIR is set to $(PKG_NAME)-$(PKG_VERSION), making it
the same as the previous case
* $(BUILD_DIR)/$(PKG_NAME)-$(PKG_VERSION)
This is the same as the default PKG_BUILD_DIR when there is no
BUILD_VARIANT.
* $(BUILD_DIR)/[name]-$(PKG_VERSION)
where [name] is a string that is identical to PKG_NAME
[1]: https://git.openwrt.org/?p=openwrt/openwrt.git;a=commit;h=e545fac8d968864a965edb9e50c6f90940b0a6c9
Signed-off-by: Jeffery To <jeffery.to@gmail.com>
