Cannot compile on Haiku OS with gcc 7

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gcc -c -fwrapv -fno-strict-aliasing -pipe -D_FORTIFY_SOURCE=2 -O -DVERSION="1.221" -DXS_VERSION="1.221" -fpic "-I/packages/perl-5.26.1-2/.self/lib/perl5/5.26.1/x86_64-haiku/CORE" -D_STDIR="/tmp" -D__haiku__ -D_DEFAULT_UMASK=0007 UUID.c
In file included from UUID.xs:8:0:
/boot/system/develop/headers/os/kernel/OS.h:349:8: error: unknown type name 'bool'
extern bool has_data(thread_id thread);
^~~~
/boot/system/develop/headers/os/kernel/OS.h:425:2: error: unknown type name 'bool'
bool enabled;
^~~~
In file included from UUID.xs:2:0:
UUID.xs: In function 'MD5Init':

The problem appears because UUID.xs explicitly undefines bool for HAIKU. The patch is incoming.

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#30