Switch to the lowmem tremor branch

in addition to using slightly less memory, this branch also doesn't seem
to have the same issues with `-O2` builds that the main branch has.

lib/tremor/CMakeLists.txt

@@ -2,9 +2,7 @@
 #
 # SPDX-License-Identifier: GPL-3.0-only
 idf_component_register(
-  SRCS block.c codebook.c floor0.c floor1.c info.c mapping0.c mdct.c registry.c
-  res012.c sharedbook.c synthesis.c vorbisfile.c window.c
-  INCLUDE_DIRS "."
-  REQUIRES "ogg")
-
-target_compile_options("${COMPONENT_LIB}" PRIVATE -Og)
+  SRCS bitwise.c codebook.c dsp.c floor0.c floor1.c floor_lookup.c framing.c
+  info.c mapping0.c mdct.c misc.c res012.c vorbisfile.c
+  INCLUDE_DIRS ".")
+target_compile_options("${COMPONENT_LIB}" PRIVATE -Wno-error=misleading-indentation -Wno-error=maybe-uninitialized -Wno-error=char-subscripts -Wno-error=unused-label)