package/foot: support soft-float architecture

Architecture using soft float don't support the math FE_* exceptions.
This commit adds a patch to conditionnally build the FE_* exception
handling.

Fixes:
    https://autobuild.buildroot.org/results/88d/88d764dd12bdbdbe633ebc703c461ebe95b75693/

Signed-off-by: Thomas Bonnefille <thomas.bonnefille@bootlin.com>
Signed-off-by: Julien Olivain <ju.o@free.fr>
(cherry picked from commit ac83fdcb29f64af79839bb8efffbaae71f0cc3cc)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/foot/0001-box-drawings-handle-architecture-with-soft-float.patch

@@ -0,0 +1,42 @@
+From 9443ac7e2937bb4f26cf44c73bb8150860c5df45 Mon Sep 17 00:00:00 2001
+From: Thomas Bonnefille <thomas.bonnefille@bootlin.com>
+Date: Tue, 4 Feb 2025 09:48:13 +0100
+Subject: [PATCH] box-drawings: handle architecture with soft-float
+
+Currently, architecture using soft-floats doesn't support instructions
+FE_INVALID, FE_DIVBYZERO, FE_OVERFLOW and FE_UNDERFLOW and so building
+on those architectures results with a build error.
+As the sqrt math function should set errno to EDOM if an error occurs,
+fetestexcept shouldn't be mandatory.
+
+This commit removes the float environment error handling.
+
+Upstream: https://codeberg.org/dnkl/foot/commit/9443ac7e2937bb4f26cf44c73bb8150860c5df45
+Signed-off-by: Thomas Bonnefille <thomas.bonnefille@bootlin.com>
+---
+ box-drawing.c | 4 +---
+ 1 file changed, 1 insertion(+), 3 deletions(-)
+
+diff --git a/box-drawing.c b/box-drawing.c
+index 1c613051..421ff54d 100644
+--- a/box-drawing.c
++++ b/box-drawing.c
+@@ -1462,14 +1462,12 @@ draw_box_drawings_light_arc(struct buf *buf, char32_t wc)
+      */
+     for (double i = y_min*16; i <= y_max*16; i++) {
+         errno = 0;
+-        feclearexcept(FE_ALL_EXCEPT);
+ 
+         double y = i / 16.;
+         double x = circle_hemisphere * sqrt(c_r2 - (y - c_y) * (y - c_y)) + c_x;
+ 
+         /* See math_error(7) */
+-        if (errno != 0 ||
+-            fetestexcept(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW))
++        if (errno != 0)
+         {
+             continue;
+         }
+-- 
+2.48.1
+