This patch makes LuaJIT build with stubbed FFI, allowing it to work on Vita

to build, apply the patch to a luajit tarball using

patch -p1 < luajit.patch

then build with

make CFLAGS="-DLUAJIT_USE_SYSMALLOC -DLJ_FFI_STUB -DLUAJIT_DISABLE_JIT" HOST_CC="gcc -m32" CROSS=arm-vita-eabi- TARGET=arm BUILDMODE=static TARGET_SYS=vita

which makes everything sort of work. finally, make install as usual.