perf/Perf-Trace-Util: fix broken include in Context.xs

765532c8 (perf script: Finish the rename from trace to script,
2010-12-23) made a mistake during find-and-replace replacing
"../../../util/trace-event.h" with "../../../util/script-event.h", a
non-existent file.  Fix this include.

Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>
perf: squelch warnings from perl.h to compile-pass

Currently, a simple

  $ make

errors out because we compile with -Werror by default, turning all
warnings into errors.  Although no warnings are emitted by our code
itself, two kinds of warnings are emitted by perl.h (perl 5.18.0):

  -Wundef and -Wswitch-default

Use #pragma statements to squelch exactly those warnings.  The next
patch will regenerate Context.c from Context.xs and make the compile
pass.

Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Namhyung Kim <namhyung.kim@lge.com>
Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>
perf/Perf-Trace-Util: regenerate Context.c

From Context.xs, using the procedure described in the README.  Now, a
simple

  $ make

builds everything correctly.

Cc: Tom Zanussi <tom.zanussi@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>