Makefile: add msvs_common.sh to DIST-SRCS

dist is broken in msvs currently due to a dependency on libs.mk which in
turn depends on the rest of the source tree, not just the examples

Change-Id: I3e313ceeae81eb29ef4bfb099d89756b43583eaa
diff --git a/build/make/Makefile b/build/make/Makefile
index 03dacce..c4d53f1 100644
--- a/build/make/Makefile
+++ b/build/make/Makefile
@@ -411,6 +411,7 @@
     DIST-SRCS-$(CONFIG_MSVS)  += build/make/gen_msvs_proj.sh
     DIST-SRCS-$(CONFIG_MSVS)  += build/make/gen_msvs_sln.sh
     DIST-SRCS-$(CONFIG_MSVS)  += build/make/gen_msvs_vcxproj.sh
+    DIST-SRCS-$(CONFIG_MSVS)  += build/make/msvs_common.sh
     DIST-SRCS-$(CONFIG_MSVS)  += build/x86-msvs/obj_int_extract.bat
     DIST-SRCS-$(CONFIG_MSVS)  += build/arm-msvs/obj_int_extract.bat
     DIST-SRCS-$(CONFIG_RVCT) += build/make/armlink_adapter.sh