- disable -fno-lto; base-gcc doesn't understand it
- don't build with -O3 by default

Index: setup.py
--- setup.py.orig
+++ setup.py
@@ -355,8 +355,8 @@ if BUILD_SPEED3:
         'msvc': ['/O3', ],
         'mingw32': ['-O3',],
         'unix': ['-O3',],
-        'clang': ['-O3',],
-        'gcc': ['-O3',],
+        'clang': ['',],
+        'gcc': ['',],
     }
 ###
 # DVERSION - pass module version string
@@ -399,7 +399,7 @@ if SUP_DEBUG:
             COPT[comp].extend([ '-DZSTD_DEBUG=1','-g',
             ])
 
-if BUILD_NO_LTO:
+if 0 and BUILD_NO_LTO:
     for comp in COPT:
         if comp == 'msvc':
             pass
