Added support for LLVM 12

Makefile

@@ -133,14 +133,18 @@ ifneq ($(ENABLE_LLVM), 0)
 		LLVM_VERSION := $(shell llvm-config --version)
 
 		# If findstring is not empty, then it have found the value
-		ifneq (, $(findstring 11,$(LLVM_VERSION)))
+		ifneq (, $(findstring 12,$(LLVM_VERSION)))
+			compilers += llvm
+		else ifneq (, $(findstring 11,$(LLVM_VERSION)))
 			compilers += llvm
 		else ifneq (, $(findstring 10,$(LLVM_VERSION)))
 			compilers += llvm
 		endif
 	# … or try to autodetect LLVM from `llvm-config-<version>`.
 	else
-		ifneq (, $(shell which llvm-config-11 2>/dev/null))
+		ifneq (, $(shell which llvm-config-12 2>/dev/null))
+			compilers += llvm
+		else ifneq (, $(shell which llvm-config-11 2>/dev/null))
 			compilers += llvm
 		else ifneq (, $(shell which llvm-config-10 2>/dev/null))
 			compilers += llvm