Some miscellaneous changes from my Meson investigation (libusual#49)

* Use ISO C __typeof__ instead of GNU C typeof

I don't see any reason this has to be the GNU variant.

* Factor out the pgutil_kwlookup gperf generation

This makes it easier to share code with Meson builds.

* Update pgutil_kwlookup.h

Makefile

@@ -157,20 +157,14 @@ dox:
 
 PG_CONFIG ?= pg_config
 KWLIST = $(shell $(PG_CONFIG) --includedir-server)/parser/kwlist.h
-GPERF = gperf -m5
 
 # requires 8.4+
 kws:
 	@test -f "$(KWLIST)" || { echo "kwlist.h not found"; exit 1; }
-	grep '^PG_KEYWORD' "$(KWLIST)" \
-	| grep -v UNRESERVED \
-	| sed 's/.*"\(.*\)",.*, *\(.*\)[)].*/\1/' \
-	>> usual/pgutil_kwlookup.gp
-
-kwh:
-	$(GPERF) usual/pgutil_kwlookup.g \
-	| sed '/^#line/d' \
-	> usual/pgutil_kwlookup.h
+	./mk/gen-pgutil_kwlookup_gp.sh "$(KWLIST)" >> usual/pgutil_kwlookup.gp
+
+kwh: usual/pgutil_kwlookup.g
+	./mk/gen-pgutil_kwlookup_h.sh $^ > usual/pgutil_kwlookup.h
 
 sizes: all
 	size `find .objs -name '.libs' -prune -o -name '*.o' -print | sort`

mk/gen-pgutil_kwlookup_gp.sh

@@ -0,0 +1,5 @@
+#!/bin/sh
+
+grep '^PG_KEYWORD' "$1" \
+	| grep -v UNRESERVED \
+	| sed 's/.*"\(.*\)",.*, *\(.*\)[)].*/\1/'

mk/gen-pgutil_kwlookup_h.sh

@@ -0,0 +1,4 @@
+#!/bin/sh
+
+gperf -m5 "$1" \
+	| sed '/^#line/d'

usual/pgutil.c

@@ -278,7 +278,7 @@ struct StrList *pg_parse_array(const char *pgarr, CxMem *cx)
 #define long uintptr_t
 
 /* include gperf code */
-const char *pg_keyword_lookup_real(const char *str, unsigned int len);
+const char *pg_keyword_lookup_real(const char *str, size_t len);
 #include <usual/pgutil_kwlookup.h>
 
 bool pg_is_reserved_word(const char *str)