initial buildroot for linux 5.15

package/janet/Config.in

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+config BR2_PACKAGE_JANET
+	bool "janet"
+	help
+	  Janet is a functional and imperative programming language.
+	  The entire language (core library, interpreter, compiler,
+	  assembler, PEG) is less than 1MB. You can also add Janet
+	  scripting to an application by embedding a single C file
+	  and two headers.
+
+	  https://janet-lang.org/

package/janet/janet.hash

@@ -0,0 +1,5 @@
+# Locally calculated
+sha256  bfc29c11a070cc175666f74eb99ea992276d6e269701ba9558a72cef05ac80b4  janet-1.18.1.tar.gz
+
+# Locally calculated
+sha256  e2d2ae8360d95386af751ac7d1a3da36ea8ceb230e5f0eba7eb762547b1c58c9  LICENSE

package/janet/janet.mk

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+################################################################################
+#
+# janet
+#
+################################################################################
+
+JANET_VERSION = 1.18.1
+JANET_SITE = $(call github,janet-lang,janet,v$(JANET_VERSION))
+JANET_LICENSE = MIT
+JANET_LICENSE_FILES = LICENSE
+
+JANET_INSTALL_STAGING = YES
+
+ifeq ($(BR2_STATIC_LIBS),y)
+JANET_CONF_OPTS += -Ddynamic_modules=false
+endif
+
+# Uses __atomic_fetch_add_4
+ifeq ($(BR2_TOOLCHAIN_HAS_LIBATOMIC),y)
+JANET_LDFLAGS += $(TARGET_LDFLAGS) -latomic
+endif
+
+ifeq ($(BR2_TOOLCHAIN_HAS_THREADS),)
+JANET_CONF_OPTS += -Dsingle_threaded=true
+endif
+
+$(eval $(meson-package))