libgcrypt fails to compile with Xcode 9 against iOS 11 SDK

[Chris Ballinger]

This affects 1.7.x (and probably lower) through 1.8.1. The issue is that
calling 'system()' is not allowed on iOS and is a now compile error with
the latest Xcode 9 / iOS 11 toolchain.

For now I will just comment out the system() calls, but I'll submit a
better ifdef patch when I get around to it.


random.c:556:11: error: 'system' is unavailable: not available on iOS

      if (system (cmdline))

          ^

/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator11.0.sdk/usr/include/stdlib.h:195:6:
note:

      'system' has been explicitly marked unavailable here

int      system(const char *) __DARWIN_ALIAS_C(system);

         ^
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