Ports: Add missing .so extension for ffmpeg library SONAMEs

Author: https://github.com/gunnarbeutner
Commit: https://github.com/SerenityOS/serenity/commit/8603041ed81
Pull-request: https://github.com/SerenityOS/serenity/pull/6963
Reviewed-by: https://github.com/alimpfard

Ports/ffmpeg/package.sh

@@ -20,7 +20,7 @@ configure() {
 install() {
     run make DESTDIR=${SERENITY_INSTALL_ROOT} $installopts install
     for lib in libavcodec libavdevice libavfilter libavformat libavutil; do
-        ${CC} -shared -o ${SERENITY_INSTALL_ROOT}/usr/local/lib/${lib}.so -Wl,-soname,${lib} -Wl,--whole-archive ${SERENITY_INSTALL_ROOT}/usr/local/lib/${lib}.a -Wl,--no-whole-archive -liconv -ltiff -llzma -lbz2
+        ${CC} -shared -o ${SERENITY_INSTALL_ROOT}/usr/local/lib/${lib}.so -Wl,-soname,${lib}.so -Wl,--whole-archive ${SERENITY_INSTALL_ROOT}/usr/local/lib/${lib}.a -Wl,--no-whole-archive -liconv -ltiff -llzma -lbz2
         rm -f ${SERENITY_INSTALL_ROOT}/usr/local/lib/$lib.la
     done
 }