toolchain: fix the sysroot mess by getting rid of $(TOOLCHAIN_DIR)/usr and moving it back to $(TOOLCHAIN_DIR), this change makes the toolchain relocatable again, which should fix the SDK

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uhttpd: - fix parsing of interpreter entries in the config file, fixes serving of static files as .cgi with X-Wrt - better cope with connection aborts, especially during header transfer - fix return value checking of TLS reads and writes, solves some blocking issues

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ath9k: remove an unnecessary BUG_ON in the aggregation code and clean up block ack window tracking to use less memory

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ar71xx: add a new driver for the ar7240 switch using swconfig. hooks directly into the ethernet driver, as MAC resets also require switch reinitializations and the switch is part of the cpu core anyway switch only tl-wr741nd (and other devices using this board file, such as tl-wr841nd) over to using this by default, as other devices are still untested fixes #7563

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Thanks bartbes

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Before building a build variant would have removed the staging files installed
by the previous build variant from the same makefile.

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package/grub: add a prereq check for 32 bits host development files when building on x86_64 (closes: #7753)

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package/busybox: add missing bits from 1.17.1 update (mostly config stuff), rename upstream patches so they're applied first

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Reading the CFE properties causes system hangs on some devices. With
this patch nvram read will be successful very time so cfe will no be
read out. This code is not really correct but it will work around some
problems for some people.

Related ticket: #7693

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This patch adds support for Sparklan WCR-150GN board.
Network configuration should be tweaked to make it work fully. The
reason it's not in this patch is that ramips target should be modified
to support different /etc/config/network files for different boards.

Signed-off-by: Roman Yeryomin <roman@advem.lv>

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 * patch from #7713

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