Adding a scan-build command

scan-build http://clang-analyzer.llvm.org/scan-build.html is a clang
based tool designed to provide static analysis over C code files.

regression-tests/Makefile

@@ -47,3 +47,5 @@ cooja: $(CONTIKI)/tools/cooja/dist/cooja.jar
 $(CONTIKI)/tools/cooja/dist/cooja.jar:
 	(cd $(CONTIKI)/tools/cooja; ant jar)
 
+scan-build:
+	cd scan_build && scan-build $(MAKE)

regression-tests/scan_build/Makefile

@@ -0,0 +1,16 @@
+EXAMPLESDIR=../../examples
+TOOLSDIR=../../tools
+
+EXAMPLES = \
+hello-world/minimal-net \
+hello-world/native \
+eeprom-test/native \
+example-shell/native \
+tcp-socket/minimal-net \
+telnet-server/minimal-net \
+webserver/minimal-net \
+wget/minimal-net \
+
+TOOLS=
+
+include ../Makefile.compile-test