[strace/strace] Cannot specify more than one -einject=<...>:<...>:when=<...> expression for a single syscall (#173)

[Elvira Khabirova]

For example, currently, invoking strace like this:
```
strace -einject=chdir:retval=1000:when=1 \
       -einject=chdir:retval=2000:when=2
```
injects 2000 at the second occurence of `chdir`, but ignores the first inject expression.

Considering overlapping expressions, when invoked for example like this:
```
strace -einject=<...>:<...>:when=first+step1 \
       -einject=<...>:<...>:when=first+step2
```
strace should perform both injections on steps `first+step1*step2`, in the order from first specified to last specified.

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