scripts/Makefile* Add SPDX-License-Identifier tag

A general best practice for SPDX is that Makefiles should have an
identifier, add these as everything else is currently covered.

Signed-off-by: Tom Rini <trini@konsulko.com>

scripts/Makefile.autoconf

@@ -6,6 +6,9 @@
 # When our migration to Kconfig is done
 # (= When we move all CONFIGs from header files to Kconfig)
 # this makefile can be deleted.
+#
+# SPDX-License-Identifier:	GPL-2.0
+#
 
 __all: include/autoconf.mk include/autoconf.mk.dep
 

scripts/Makefile.build

@@ -1,6 +1,9 @@
 # ==========================================================================
 # Building
 # ==========================================================================
+#
+# SPDX-License-Identifier:	GPL-2.0
+#
 
 # Modified for U-Boot
 prefix := tpl

scripts/Makefile.clean

@@ -1,6 +1,9 @@
 # ==========================================================================
 # Cleaning up
 # ==========================================================================
+#
+# SPDX-License-Identifier:	GPL-2.0
+#
 
 src := $(obj)
 

scripts/Makefile.extrawarn

@@ -9,6 +9,9 @@
 # $(call cc-option, -W...) handles gcc -W.. options which
 # are not supported by all versions of the compiler
 # ==========================================================================
+#
+# SPDX-License-Identifier:	GPL-2.0
+#
 
 ifeq ("$(origin W)", "command line")
   export KBUILD_ENABLE_EXTRA_GCC_CHECKS := $(W)

scripts/Makefile.host

@@ -19,6 +19,9 @@
 # qconf-objs      := menu.o
 # Will compile qconf as a C++ program, and menu as a C program.
 # They are linked as C++ code to the executable qconf
+#
+# SPDX-License-Identifier:	GPL-2.0
+#
 
 __hostprogs := $(sort $(hostprogs-y) $(hostprogs-m))
 

scripts/Makefile.lib

@@ -1,3 +1,6 @@
+#
+# SPDX-License-Identifier:	GPL-2.0
+#
 # Backward compatibility
 asflags-y  += $(EXTRA_AFLAGS)
 ccflags-y  += $(EXTRA_CFLAGS)

scripts/Makefile.uncmd_spl

@@ -1,5 +1,7 @@
 # Makefile version of include/config_uncmd_spl.h
 #
+# SPDX-License-Identifier:	GPL-2.0+
+#
 # TODO: Invent a better way
 
 ifdef CONFIG_SPL_BUILD