[newlib-cygwin] Cygwin: drop outdated -O3 optimization for malloc and sync

[Corinna Vinschen]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=cb21b9cc57e6f82c320c5a2b8817b09094aeac8e

commit cb21b9cc57e6f82c320c5a2b8817b09094aeac8e
Author: Corinna Vinschen <corinna@vinschen.de>
Date:   Fri Oct 22 12:47:09 2021 +0200

    Cygwin: drop outdated -O3 optimization for malloc and sync
    
    Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

Diff:
---
 winsup/cygwin/Makefile.am | 10 ----------
 1 file changed, 10 deletions(-)

diff --git a/winsup/cygwin/Makefile.am b/winsup/cygwin/Makefile.am
index f39560863..24d749987 100644
--- a/winsup/cygwin/Makefile.am
+++ b/winsup/cygwin/Makefile.am
@@ -548,16 +548,6 @@ endif
 
 dtable_CFLAGS=-fcheck-new
 
-# If an optimization level is explicitly set in CXXFLAGS, set -O3 for these files
-# XXX: this seems to assume it's not -O0?
-#
-# (the indentation here prevents automake trying to process this as an automake
-# conditional)
- ifneq "${filter -O%,$(CXXFLAGS)}" ""
-  malloc_CFLAGS=-O3
-  sync_CFLAGS=-O3
- endif
-
 #
 # libraries and installed objects
 #