[gdb/testsuite] Rewrite catch-follow-exec.exp using gdb_test
The testcase catch-follow-exec.exp is written use gdb -batch in order to avoid
a GDB SIGTTOU. After the commit of "Avoid GDB SIGTTOU on catch exec + set
follow-exec-mode new (PR 23368)", that no longer is necessary.
Rewrite the test using regular gdb_test commands.
Tested with x86_64-linux.
2018-10-24 Tom de Vries <tdevries@suse.de>
* gdb.base/catch-follow-exec.exp: Rewrite using gdb_test.
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