media-sound/pwavecat: fix build w/ C23

Drop conflicting declaration.

Closes: https://bugs.gentoo.org/945244
Signed-off-by: Sam James <sam@gentoo.org>

media-sound/pwavecat/files/pwavecat-0.4.5-c23.patch

@@ -0,0 +1,11 @@
+https://bugs.gentoo.org/945244
+--- a/parts.c
++++ b/parts.c
+@@ -38,7 +38,6 @@ return 0; /* not found */
+ struct part *install_part_at_end_of_list(char *name)
+ {
+ struct part *plast, *pnew;
+-struct part *lookup_part();
+ 
+ if(debug_flag) fprintf(stderr, "install_part(): arg name=%s\n", name);
+ 

media-sound/pwavecat/pwavecat-0.4.5-r1.ebuild

@@ -1,4 +1,4 @@
-# Copyright 1999-2023 Gentoo Authors
+# Copyright 1999-2025 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=7
@@ -18,6 +18,7 @@ PATCHES=(
 	"${FILESDIR}"/${P}-version.patch
 	"${FILESDIR}"/${P}-overflow.patch
 	"${FILESDIR}"/${P}-fno-common.patch
+	"${FILESDIR}"/${P}-c23.patch
 )
 
 src_configure() {