Update PosixCommon.cpp to prevent token error

Fixed error: expected unqualified-id before ‘{’ token

BeefySysLib/platform/posix/PosixCommon.cpp

@@ -1241,7 +1241,7 @@ BFP_EXPORT void BFP_CALLTYPE BfpSpawn_GetStdHandles(BfpSpawn* spawn, BfpFile** o
     }
 }
 
-BFP_EXPORT int BFP_CALLTYPE BfpSpawn_GetProcessId(BfpSpawn* spawn);
+BFP_EXPORT int BFP_CALLTYPE BfpSpawn_GetProcessId(BfpSpawn* spawn)
 {
     return spawn->mPid;
 }