codec: sid: use cRSID as a library for playing SID files

Change-Id: Iee70933e47ff8df8f26c9a63112de4da4a8e6c17

lib/rbcodec/codecs/cRSID/README.rockbox

@@ -0,0 +1,19 @@
+Some notes about cRSID usage in Rockbox
+by Ninja (Wolfram Sang) in 2023
+
+The cRSID codebase is from v1.0. The only change made was a separation of the
+cRSID header into a public and private one, so it could be compiled as a
+library. You can find it as a separate commit in the git repository. This
+likely needs to be updated whenever a newer version of cRSID shall be used.
+
+Currently, newer versions of cRSID are available but they have been discarded.
+v1.1 mainly adds a high quality playback mode using 7x oversampling. This is
+too much for a Sansa Clip. Because the old playback mode still exists, it might
+be possible to add a runtime option to let the user choose. As a first step
+however, it was decided to give the user a working codec without having to deal
+with options. v1.2 mainly adds a SDL-based GUI player, no bigger changes in SID
+emulation. Staying with v1.0 also keeps the codec size significantly lower
+(~50KB for v1.0 vs ~90KB for v1.2 on the Sansa Clip).
+
+cRSID Releases can be found here:
+https://csdb.dk/search/?seinsel=releases&search=crsid

lib/rbcodec/codecs/cRSID/SOURCES

@@ -0,0 +1 @@
+libcRSID.c

lib/rbcodec/codecs/cRSID/cRSID.make

@@ -0,0 +1,16 @@
+#             __________               __   ___.
+#   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+#   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+#   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+#   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+#                     \/            \/     \/    \/            \/
+
+# cRSID
+CRSID := $(CODECDIR)/cRSID.a
+CRSID_SRC := $(call preprocess, $(RBCODECLIB_DIR)/codecs/cRSID/SOURCES)
+CRSID_OBJ := $(call c2obj, $(CRSID_SRC))
+OTHER_SRC += $(CRSID_SRC)
+
+$(CRSID): $(CRSID_OBJ)
+	$(SILENT)$(shell rm -f $@)
+	$(call PRINTS,AR $(@F))$(AR) rcs $@ $^ >/dev/null