fix for emscripten etc

Author: timotheecour

lib/pure/includes/osenv.nim

@@ -68,7 +68,7 @@ when defined(windows) and not defined(nimscript):
 
 else:
   const
-    useNSGetEnviron = (defined(macosx) and not defined(ios)) or defined(nimscript)
+    useNSGetEnviron = (defined(macosx) and not defined(ios) and not defined(emscripten)) or defined(nimscript)
 
   when useNSGetEnviron:
     # From the manual:

lib/system/timers.nim

@@ -31,7 +31,7 @@ when defined(windows):
 
     result = Nanos(float64(a.int64 - b.int64) * performanceCounterRate)
 
-elif defined(macosx):
+elif defined(macosx) and not defined(emscripten):
   type
     MachTimebaseInfoData {.pure, final,
         importc: "mach_timebase_info_data_t",