Remove unused patch.

0001-Fix-return-type-of-fgetc.patch

@@ -1,31 +0,0 @@
-From 6beb3df583413a7084a9b2f6ffa6de3ea9817368 Mon Sep 17 00:00:00 2001
-From: Elliott Sales de Andrade <quantum.analyst@gmail.com>
-Date: Mon, 7 Sep 2020 23:52:27 -0400
-Subject: [PATCH] Fix return type of fgetc.
-
-On x86, this seems to work by fluke, but on other systems, it does not
-work because `(char)EOF` never equals `EOF`, causing an infinite loop.
-
-Signed-off-by: Elliott Sales de Andrade <quantum.analyst@gmail.com>
----
- src/file_line_endings.c | 4 ++--
- 1 file changed, 2 insertions(+), 2 deletions(-)
-
-diff --git a/src/file_line_endings.c b/src/file_line_endings.c
-index 4587994..e8c8709 100644
---- a/src/file_line_endings.c
-+++ b/src/file_line_endings.c
-@@ -14,8 +14,8 @@ SEXP brio_file_line_endings(SEXP path) {
-     error("Could not open file: %s", path_c);
-   }
- 
--  char c;
--  char prev_c = '\0';
-+  int c;
-+  int prev_c = '\0';
-   while ((c = fgetc(fp)) != EOF) {
-     if (c == '\n') {
-       if (prev_c == '\r') {
--- 
-2.26.2
-