package/guile: fix build on riscv32

Fix the following build failure on riscv32:

system/base/target.scm:132:16: In procedure triplet-pointer-size:
unknown CPU word size "riscv32"

Fixes:
 - http://autobuild.buildroot.org/results/6705630c1484239ec8b73d57ebc2e2570fbfc8f8

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
(cherry picked from commit 55f1afe6db597ed5d943d57d0b6acf1bbfb77a34)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/guile/0004-module-system-base-target.scm-support-riscv32.patch

@@ -0,0 +1,33 @@
+From 6142350d7c0562b0525462abdd41309ae0faa2eb Mon Sep 17 00:00:00 2001
+From: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+Date: Fri, 6 Aug 2021 19:49:37 +0200
+Subject: [PATCH] module/system/base/target.scm: support riscv32
+
+Fix the following build failure on riscv32:
+
+system/base/target.scm:132:16: In procedure triplet-pointer-size:
+unknown CPU word size "riscv32"
+
+Fixes:
+ - http://autobuild.buildroot.org/results/6705630c1484239ec8b73d57ebc2e2570fbfc8f8
+
+Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+---
+ module/system/base/target.scm | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/module/system/base/target.scm b/module/system/base/target.scm
+index 2088cd866..dba46664d 100644
+--- a/module/system/base/target.scm
++++ b/module/system/base/target.scm
+@@ -116,6 +116,7 @@
+ 
+           ((string-match "^x86_64-.*-gnux32" triplet) 4)  ; x32
+ 
++          ((string-match "32$" cpu) 4)
+           ((string-match "64$" cpu) 8)
+           ((string-match "64_?[lbe][lbe]$" cpu) 8)
+           ((member cpu '("sparc" "powerpc" "mips" "mipsel" "nios2" "m68k" "sh3" "sh4")) 4)
+-- 
+2.30.2
+