Prevent implicit conversion of float to double to avoid precision
error on i686.

  https://github.com/Maratyszcza/FP16/issues/20

Taken from Debian:

  https://salsa.debian.org/deeplearning-team/fp16/-/blob/master/debian/patches/ftbfs-i386.patch

Index: fp16/include/fp16/fp16.h
===================================================================
--- fp16.orig/include/fp16/fp16.h
+++ fp16/include/fp16/fp16.h
@@ -228,7 +228,8 @@ static inline uint16_t fp16_ieee_from_fp
 	const float scale_to_inf = fp32_from_bits(UINT32_C(0x77800000));
 	const float scale_to_zero = fp32_from_bits(UINT32_C(0x08800000));
 #endif
-	float base = (fabsf(f) * scale_to_inf) * scale_to_zero;
+	const volatile float base_inf = fabsf(f) * scale_to_inf;
+	float base = base_inf * scale_to_zero;
 
 	const uint32_t w = fp32_to_bits(f);
 	const uint32_t shl1_w = w + w;
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<tr><td><span title='2023-02-19 01:00:01 +0100'>2023-02-19</span></td><td><a href='/guix/commit/gnu/packages/unicode.scm?id=1e6ddceb8318d413745ca1c9d91fde01b1e0364b'>gnu: Use HTTPS package home pages wherever possible.</a></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2023-01-15 07:50:15 +0100'>2023-01-15</span></td><td><a href='/guix/commit/gnu/packages/unicode.scm?id=e554f101efb8ea180fd0e2dcd49c5e111b0ed677'>gnu: ucd-next: Update to 15.0.0.</a></td><td>Vivien Kraus</td></tr>
<tr><td><span title='2023-01-15 07:50:15 +0100'>2023-01-15</span></td><td><a href='/guix/commit/gnu/packages/unicode.scm?id=be0b866e959d2c5bfe4c18ae7942cae173b665eb'>gnu: libunibreak: Use ucd instead of ucd-next.</a></td><td>Vivien Kraus</td></tr>
<tr><td><span title='2022-01-25 22:07:13 -0500'>2022-01-25</span></td><td><a href='/guix/commit/gnu/packages/unicode.scm?id=1a5302435ff0d2822b823f5a6fe01faa7a85c629'>Merge branch 'master' into staging.</a></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2021-12-28 15:15:45 +0100'>2021-12-28</span></td><td><a href='/guix/commit/gnu/packages/unicode.scm?id=3ff2ac4980dacf10087e4b42bd9fbc490591900c'>gnu: ucd: Update to 14.0.0.</a></td><td>Felix Gruber</td></tr>
<tr><td><span title='2021-12-28 15:03:37 +0100'>2021-12-28</span></td><td><a href='/guix/commit/gnu/packages/unicode.scm?id=7074b9af03a91a79eb508f30fc28a709256d5aaf'>gnu: Add libunibreak.</a></td><td>Felix Gruber</td></tr>
<tr><td><span title='2021-12-28 15:03:17 +0100'>2021-12-28</span></td><td><a href='/guix/commit/gnu/packages/unicode.scm?id=e2e39d2c2fb68ef9960b628969f9f9f770cc61ac'>gnu: Add ucd-next.</a></td><td>Felix Gruber</td></tr>
<tr><td><span title='2021-09-25 09:34:36 +0200'>2021-09-25</span></td><td><a href='/guix/commit/gnu/packages/unicode.scm?id=719bbcc15e2216b59bde34f297b92ceb9d349ce0'>Update copyright assignments for Liliana Marie Prikler.</a></td><td>Liliana Marie Prikler</td></tr>