* link/z80/lkgb.c,

* link/z80/lkgb.c,
* link/z80/lkgg.c,
* src/pic16/gen.c,
* src/pic16/main.c,
* src/pic16/pcode.c,
* src/pic/main.c,
* src/pic/pcoderegs.c,
* src/SDCCicode.c,
* src/SDCCmain.c,
* src/SDCCsymt.c: replaced all exit(-1) by exit(EXIT_FAILURE) to fix
  bug 1504689 on minGW

git-svn-id: https://sdcc.svn.sourceforge.net/svnroot/sdcc/trunk/sdcc@4222 4a8a32a2-be11-0410-ad9d-d568d2c75423