remove Vim and Emacs variable settings from C source files

Done with these commands:
git grep -l Local.variab|xargs \
  perl -0x3b -pi -e 's,\n+/\*\n \* vim:(.|\n)*,\n,'

git grep -l Local.variab|xargs \
  perl -0x3b -pi -e 's,\n+/\*\n \* Local variables:\n(.|\n)*,\n,'

tests/qemuxml2xmltest.c

@@ -165,12 +165,3 @@ main(int argc, char **argv)
 int main (void) { exit (77); /* means 'test skipped' to automake */ }
 
 #endif /* WITH_QEMU */
-
-/*
- * Local variables:
- *  indent-tabs-mode: nil
- *  c-indent-level: 4
- *  c-basic-offset: 4
- *  tab-width: 4
- * End:
- */