The system compiler on RHEL7 fails to build the latest linux-uuid.
```
util-linux-uuid@2.37.4%gcc@4.8.5 arch=linux-rhel7-haswell
```
results in:
```
libuuid/src/unparse.c:42:73: error: expected ';', ',' or ')' before 'fmt'
static void uuid_fmt(const uuid_t uuid, char *buf, char const *restrict fmt)
```
It looks like it's assuming C99 by default so there may be a better way
to handle this... but this at least works
ab1e9d717e