Fix luajit

Compiles and luajit executable passes tests found at
https://github.com/LuaJIT/LuaJIT-test-cleanup (excluding some that
appear to be related to the static build).

Compiled without W^X memory permission support because there appears to
be some issue with the mprotect() call.

recipes/wip/dev/lang/luajit/recipe.toml

-#TODO missing script for "make", see https://luajit.org/install.html
+#TODO remove -DLUAJIT_SECURITY_MCODE=0
 [source]
-tar = "https://luajit.org/download/LuaJIT-2.1.0-beta3.tar.gz"
+# LuaJIT is only available as a rolling release
+git = "https://luajit.org/git/luajit.git"
+rev = "2090842410e0ba6f81fad310a77bf5432488249a"
+
 [build]
 template = "custom"
+script = """
+rsync -av --delete "${COOKBOOK_SOURCE}/" ./
+
+# Cookbook doesn't apply patches to git repositiories (so we do it manually)
+# The patch is applied so that LUAJIT_OS is set to LUAJIT_OS_POSIX without
+# redefinition warnings
+git apply "${COOKBOOK_RECIPE}/redox.patch"
+
+${COOKBOOK_MAKE} -j ${COOKBOOK_MAKE_JOBS} install \
+  PREFIX="${COOKBOOK_STAGE}" \
+  BUILDMODE='static' \
+  TARGET_SYS='Redox' \
+  XCFLAGS='-DLUAJIT_SECURITY_MCODE=0' \
+  CROSS="${TARGET}-"
+
+cd "${COOKBOOK_STAGE}"/bin && ln -s luajit-2.1.* luajit
+"""

recipes/wip/dev/lang/luajit/redox.patch

+diff --git a/src/Makefile b/src/Makefile
+index 3a6a4329..450e8fe6 100644
+--- a/src/Makefile
++++ b/src/Makefile
+@@ -351,6 +351,9 @@ else
+   ifeq (GNU/kFreeBSD,$(TARGET_SYS))
+     TARGET_XLIBS+= -ldl
+   endif
++  ifeq (Redox,$(TARGET_SYS))
++    TARGET_XCFLAGS+= -DLUAJIT_OS=LUAJIT_OS_POSIX
++  endif
+ endif
+ endif
+ endif
+@@ -367,12 +370,16 @@ ifneq ($(HOST_SYS),$(TARGET_SYS))
+   else
+   ifeq (iOS,$(TARGET_SYS))
+     HOST_XCFLAGS+= -DLUAJIT_OS=LUAJIT_OS_OSX -DTARGET_OS_IPHONE=1
++  else
++  ifeq (Redox,$(TARGET_SYS))
++    HOST_XCFLAGS+= -DLUAJIT_OS=LUAJIT_OS_POSIX
+   else
+     HOST_XCFLAGS+= -DLUAJIT_OS=LUAJIT_OS_OTHER
+   endif
+   endif
+   endif
+   endif
++  endif
+ endif
+ 
+ ifneq (,$(CCDEBUG))