Added MM decomp as submodule and added workaround file to avoid needing to build it

.gitmodules

@@ -10,3 +10,6 @@
 [submodule "lib/freetype-windows-binaries"]
 	path = lib/freetype-windows-binaries
 	url = https://github.com/ubawurinna/freetype-windows-binaries
+[submodule "lib/mm-decomp"]
+	path = lib/mm-decomp
+	url = https://github.com/zeldaret/mm

lib/mm-decomp

@@ -0,0 +1 @@
+Subproject commit 5607eec18bae68e4cd38ef6d1fa69d7f1d84bfc8

patches/Makefile

@@ -5,7 +5,7 @@ LD      := ld.lld
 OBJCOPY := llvm-objcopy
 
 CFLAGS   := -target mips -mips2 -mabi=32 -O2 -mno-abicalls -mno-odd-spreg -fomit-frame-pointer -mno-check-zero-division -G0 -Wall -Wextra -Wno-incompatible-library-redeclaration -Wno-unused-parameter -Wno-unknown-pragmas -Wno-unused-variable -Wno-missing-braces
-CPPFLAGS := -nostdinc -D_LANGUAGE_C -DMIPS -I ../../mm/include -I ../../mm/src -I ../../mm/build -I ../../mm/assets -I../lib/RT64-HLE/include
+CPPFLAGS := -nostdinc -D_LANGUAGE_C -DMIPS -I. -I ../lib/mm-decomp/include -I ../lib/mm-decomp/src -I ../lib/mm-decomp/assets -I../lib/RT64-HLE/include
 LDFLAGS  := -nostdlib -T patches.ld -T syms.ld --just-symbols=../mm.us.rev1.elf --allow-multiple-definition
 BINFLAGS := -O binary
 

patches/code/sub_s/sub_s.h

@@ -0,0 +1,10 @@
+// Required to include MM decomp headers without having built the repo
+
+#ifndef SUB_S_H
+#define SUB_S_H 1
+
+extern Vtx codeVtx_120260[];
+extern Gfx gShadowMaterialDL[];
+extern Gfx gShadowModelDL[];
+
+#endif