Fix ?: statements.

Omitting the first branch in ?: is a GNU extension.  Cute,
but not supported by other compilers.  Replaced mostly
by explicit tests.  Calls to getenv() simply are repeated
on non-GNU compilers.

Signed-off-by: Jason Riedy <ejr@cs.berkeley.edu>
diff --git a/apply.c b/apply.c
index 7c1a841..ee59be6 100644
--- a/apply.c
+++ b/apply.c
@@ -1377,7 +1377,7 @@
 
 static int use_patch(struct patch *p)
 {
-	const char *pathname = p->new_name ? : p->old_name;
+	const char *pathname = p->new_name ? p->new_name : p->old_name;
 	struct excludes *x = excludes;
 	while (x) {
 		if (fnmatch(x->path, pathname, 0) == 0)