User-Agent:       Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101
Firefox/60.0
Build Identifier: 

Random crashes

Reproducible: Sometimes

Steps to Reproduce:
Play for a while
Actual Results:  
Crashes

Expected Results:  
Game continues

I find it curious that `zypper info 0ad --requires` lists libmozjs38.so, but
0ad [seems to use its own patched version of this
library](https://trac.wildfiregames.com/browser/ps/trunk/libraries/source/spidermonkey)

    [19774.210902] pyrogenesis[10135]: segfault at 0 ip 00007ff66458d010 sp
00007ffc2f31bfe8 error 4 in libmozjs-38.so[7ff664477000+6b4000]
    [19774.210911] Code: ff e8 94 a6 ee ff e9 d9 cc ee ff e9 e0 cc ee ff 66 2e
0f 1f 84 00 00 00 00 00 48 8b 47 30 48 39 70 20 77 06 48 3b 70 28 72 30 <48> 8b
16 48 85 d2 74 28 48 89 d1 48 81 e1 00 00 f0 ff 48 81 c9 e8