pkg on RISC-V

[Kristof Provost]

Hi,

I’ve been toying around with packages on RISC-V, and discovered that 
it failed to bootstrap.
Autosetup tries to build jimsh0 but does not pass CFLAGS to cc, which 
won’t work on RISC-V. It requires extra flags for any compile.

The attached patch fixes that for me.

Best regards,
Kristof
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