wscript: Remove the forced -O3 compiler flag

-O3 is problematic for two reasons. First, it prevents user
to specify the optimization level (through CFLAGS/CXXFLAGS)
because wscript appends to the flags. Second, some versions
of gcc are known to produce broken code when -O3 is enabled.

git-svn-id: http://subversion.jackaudio.org/jack/jack2/trunk/jackmp@4094 0c269be4-1314-0410-8aa9-9f06e86f4224

wscript

@@ -108,8 +108,8 @@ def configure(conf):
     #   conf.check_tool('compiler_cxx')
     #   conf.check_tool('compiler_cc')
  
-    conf.env.append_unique('CXXFLAGS', '-O3 -Wall')
-    conf.env.append_unique('CCFLAGS', '-O3 -Wall')
+    conf.env.append_unique('CXXFLAGS', '-Wall')
+    conf.env.append_unique('CCFLAGS', '-Wall')
 
     conf.sub_config('common')
     if conf.env['IS_LINUX']: