Remove use of deprecated stringWithCString

Author: Pieter de Bie

PBGitBinary.m

@@ -66,7 +66,7 @@ + (void) initialize
 
 	// Try to find the path of the Git binary
 	char* path = getenv("GIT_PATH");
-	if (path && [self acceptBinary:[NSString stringWithCString:path]])
+	if (path && [self acceptBinary:[NSString stringWithUTF8String:path]])
 		return;
 
 	// No explicit path. Try it with "which"

gitx.mm

@@ -132,7 +132,7 @@ int main(int argc, const char** argv)
 	NSMutableArray* arguments = [NSMutableArray arrayWithCapacity:argc];
 	int i = 0;
 	for (i = 0; i < argc; i++)
-		[arguments addObject: [NSString stringWithCString:argv[i]]];
+		[arguments addObject: [NSString stringWithUTF8String:argv[i]]];
 
 	if (!isatty(STDIN_FILENO) && fdopen(STDIN_FILENO, "r"))
 		handleSTDINDiff(proxy);