Make:Allow for extension in tool names.

In some build environments executable programs have a specific file
extension.  The value of BIN_EXT is appended to the relevant tool file
names to allow for this.
The value of BIN_EXT is set, where appropriate, by the build environment
specific make helper (to .exe for Windows build environments).

.gitignore is updated to hide the new (.exe) files.

Change-Id: Icc32f64b750e425265075ad4e0dea18129640b86
diff --git a/tools/fip_create/Makefile b/tools/fip_create/Makefile
index b12e063..2e367c2 100644
--- a/tools/fip_create/Makefile
+++ b/tools/fip_create/Makefile
@@ -32,7 +32,7 @@
 include ${MAKE_HELPERS_DIRECTORY}build_macros.mk
 include ${MAKE_HELPERS_DIRECTORY}build_env.mk
 
-PROJECT := fip_create
+PROJECT := fip_create${BIN_EXT}
 OBJECTS := fip_create.o
 COPIED_H_FILES := uuid.h firmware_image_package.h