cbootimage: Add 'b' (binary) flag when using fopen to open a binary file.

Add 'b' (binary) flag when using fopen to open a binary file.
This keeps Windows from expanding \n to \r\n and interpreting
<ctrl>z as end of file. The change is to support a Windows
hosted coreboot build environment.

Signed-off-by: Scott Duplichan <scott@notabs.org>
Signed-off-by: Stephen Warren <swarren@nvidia.com>
diff --git a/src/set.c b/src/set.c
index 0af6686..e8ae3dd 100644
--- a/src/set.c
+++ b/src/set.c
@@ -53,7 +53,7 @@
 	FILE *fp;
 	struct stat stats;
 
-	fp = fopen(filename, "r");
+	fp = fopen(filename, "rb");
 	if (fp == NULL) {
 		result = 1;
 		return result;