package/llvm-project: new group for llvm packages

To make updating easier in the future, group all llvm projects in
one subfolder and define some variables for all of them.

Introduce LLVM_PROJECT_VERSION_MAJOR to be used by the clang package
in a followup change.

Signed-off-by: Daniel Lang <d.lang@abatec.at>
Reviewed-by: Romain Naour <romain.naour@smile.fr>
Signed-off-by: Romain Naour <romain.naour@smile.fr>
Signed-off-by: Sebastian Weyer <sebastian.weyer@smile.fr>
Tested-by: Adam Duskett <adam.duskett@amarulasolutions.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

DEVELOPERS

@@ -660,6 +660,7 @@ F:	package/glibmm2_66/
 F:	package/gtkmm3/
 F:	package/libsigc/
 F:	package/libsigc2/
+F:	package/llvm-project/
 F:	package/paho-mqtt-cpp/
 F:	package/pangomm/
 F:	package/pangomm2_46/

package/llvm-project/llvm-project.mk

@@ -0,0 +1,11 @@
+################################################################################
+#
+# llvm-project
+#
+################################################################################
+
+LLVM_PROJECT_VERSION_MAJOR = 11
+LLVM_PROJECT_VERSION = $(LLVM_PROJECT_VERSION_MAJOR).1.0
+LLVM_PROJECT_SITE = https://github.com/llvm/llvm-project/releases/download/llvmorg-$(LLVM_PROJECT_VERSION)
+
+include $(sort $(wildcard package/llvm-project/*/*.mk))