bdf2ttf: apply `gcc-``5 build fix

Fetched as:

$ curl -L https://patch-diff.githubusercontent.com/raw/koron/bdf2ttf/pull/9.patch

From 87d9f987517c78c444d1d425e33c9a5f06ced3ce Mon Sep 17 00:00:00 2001

From: Sergei Trofimovich <slyich@gmail.com>

Date: Thu, 22 Jan 2026 06:35:12 +0000

Subject: [PATCH] bdf.c: fix the build against -std=c23

`gcc-15` switched to `c23` by default and `bdf2tff`

started to fail the build as:

````

src/bdf.c:131:1: error: conflicting types for 'glyph_open'; have 'bdf_glyph_t *(int,  int)' {aka 'struct _bdf_glyph_t *(int,  int)'}

  131 | glyph_open(int width, int height)

      | ^~~~~~~~~~

src/bdf.c:60:25: note: previous declaration of 'glyph_open' with type 'bdf_glyph_t *(void)' {aka 'struct _bdf_glyph_t *(void)'}

   60 | static bdf_glyph_t*     glyph_open();

      |                         ^~~~~~~~~~

````

THe change fixed explicit prototype for a forward declaration.

---

 src/bdf.c | 2 +-

 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/bdf.c b/src/bdf.c

index 0832092..08272ed 100644

--- a/src/bdf.c

+++ b/src/bdf.c

@@ -57,7 +57,7 @@ static width_table_t cell_width_table[] = {

 static int	bdf_load_fh(bdf_t* font, FILE* fp);

 static void	count_validglyph(bdf_t* font);

-static bdf_glyph_t*	glyph_open();

+static bdf_glyph_t*	glyph_open(int width, int height);

 static void		glyph_close(bdf_glyph_t *glyph);

 static char*	iscmd(char* target, char* keyword);

 static int	atoi_next(char** str);

    hash = "sha256-235BTcTaC/30yLlgo0OO2cp3YCHWa87GFJGBx5lmz6o=";

  };

  patches = [

    # gcc-15 build fix: https://github.com/koron/bdf2ttf/pull/9

    ./gcc-15.patch

  ];

  dontConfigure = true;

  makeFlags = [ "gcc" ];