cmake: Add script to find Unicorn.

externals/cmake-modules/FindUnicorn.cmake

@@ -0,0 +1,18 @@
+# Exports:
+#  LIBUNICORN_FOUND
+#  LIBUNICORN_INCLUDE_DIR
+#  LIBUNICORN_LIBRARY
+
+find_path(LIBUNICORN_INCLUDE_DIR
+          unicorn/unicorn.h
+          HINTS $ENV{UNICORNDIR}
+          PATH_SUFFIXES include)
+
+find_library(LIBUNICORN_LIBRARY
+             NAMES unicorn
+             HINTS $ENV{UNICORNDIR})
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(unicorn DEFAULT_MSG
+                                  LIBUNICORN_LIBRARY LIBUNICORN_INCLUDE_DIR)
+mark_as_advanced(LIBUNICORN_INCLUDE_DIR LIBUNICORN_LIBRARY)