Bug#1093825: ffmpeg: Please let ffmpeg recognize the configure file loongarch

[wuruilong <wuruilong@loongson.cn>]

Source: ffmpeg
Version: 7:7.1-3
Severity: normal
Tags: sid patch
X-Debbugs-Cc: wuruilong@loongson.cn
User: debian-loongarch@lists.debian.org
Usertags: loong64

Dear Maintainer,

This code is added to make the ffmpeg source code configure file recognize loongarch when compiling. 
For example,

    loongarch*)
        arch="loongarch"

wuruilong

--- ffmpeg-7.1/debian/rules	2025-01-23 03:25:59.030220295 +0000
+++ ffmpeg/debian/rules	2025-01-23 03:09:09.192829329 +0000
@@ -81,6 +81,12 @@
 	CONFIG += --disable-libvpl
 endif
 
+ifeq (loong64,$(DEB_HOST_ARCH_CPU))
+	CONFIG += --arch=$(DEB_HOST_GNU_CPU)
+else
+	CONFIG += --arch=$(DEB_HOST_ARCH_CPU)
+endif
+
 # The standard configuration only uses the shared CONFIG.
 CONFIG_standard = --enable-shared