genksyms: Mark is_reserved_word static

The genksyms keyword gperf hash provides a function is_reserved_word.
genksyms #includes the resulting generated file keywords.c, so the
function gets used only in the same source file that defines it.  Mark
is_reserved_word static, and regenerate the corresponding generated
file.

Signed-off-by: Josh Triplett <josh@joshtriplett.org>
diff --git a/scripts/genksyms/keywords.gperf b/scripts/genksyms/keywords.gperf
index 5ef3733..8fe977a 100644
--- a/scripts/genksyms/keywords.gperf
+++ b/scripts/genksyms/keywords.gperf
@@ -1,4 +1,6 @@
 %{
+struct resword;
+static const struct resword *is_reserved_word(register const char *str, register unsigned int len);
 %}
 struct resword { const char *name; int token; }
 %%