RFR [XS]: 8232052: use string literal for format string when handling PauseAtStartupFile

[Baesken, Matthias]

Hello,  please review the following change .

Currently only on Linux (os_linux.cpp) the format string is a string literal and not a variable when handling the PauseAtStartupFile flag.
This was done on Linux with
https://bugs.openjdk.java.net/browse/JDK-8042894
when handling gcc warnings / warning related pragmas; however on the other platforms it is recommended to do the same.


Bug/webrev :

https://bugs.openjdk.java.net/browse/JDK-8232052

http://cr.openjdk.java.net/~mbaesken/webrevs/8232052.0/


Thanks, Matthias