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Shellcraft stackargs (#2219)

From: Peace-Maker <peace-maker@wcfan.de>

* Shellcraft: Fix spilling syscall args to the stack

There was a typo in the generated syscall template causing only the last
stack argument to be generated.

$ shellcraft -f asm mips.linux.sendto 3 0x123456 0x100 0 0xabcdefff 0x10
The 0xabcdefff argument was missing.

* Shellcraft: Generate 6 syscall arguments for unknown functions

There are syscalls with 6 arguments like mmap and sendto which couldn't
be called with all 6 arguments set.

$ shellcraft -f asm mips.linux.mmap2 0 0x1000
'PROT_READ | PROT_WRITE | PROT_EXEC' 'MAP_PRIVATE | MAP_ANONYMOUS' -1 0

* Shellcraft: Fix typo in error message

The `syscalls` variable is only present in the generate.py, not the
generated template.

* Regenerate syscall templates

* MIPS shellcraft: Push last two syscall arguments to the stack

The mips.linux.syscall template was only handling 4 syscall arguments
and silently discarded the remaining ones. Push the arguments to the stack
instead.

$ shellcraft -f asm mips.linux.syscall SYS_sendto 3 0x123456 0x100 0 0xabcdefff 0x10

Fixes #2153

* Fix mips syscall doctest

* Update CHANGELOG

Co-authored-by: Peace-Maker <peace-maker@wcfan.de>

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