luaposix: use fake uname script to fix OS detection

Avoid picking up the host OS for detecting the build type
Fixes build on macOS

Signed-off-by: Felix Fietkau <nbd@nbd.name>

lang/luaposix/Makefile

@@ -34,6 +34,8 @@ define Package/luaposix/description
   to various low level libc functions.
 endef
 
+TARGET_PATH_PKG:=$(CURDIR)/scripts:$(TARGET_PATH_PKG)
+
 TARGET_CFLAGS += \
 	-I$(STAGING_DIR)/usr/include
 

lang/luaposix/scripts/uname

@@ -0,0 +1,2 @@
+#!/bin/sh
+echo Linux