merge r3368, r3392:

./configure related fixes:

*) test invalid --with-ld-opt in right place
*) do not add NGX_GCC_OPT twice: it is added later with -W

auto/cc/conf

@@ -104,6 +104,7 @@ else
 fi
 
 CFLAGS="$CFLAGS $NGX_CC_OPT"
+NGX_TEST_LD_OPT="$NGX_LD_OPT"
 
 
 if [ "$NGX_PLATFORM" != win32 ]; then

auto/cc/gcc

@@ -51,8 +51,6 @@ esac
 #NGX_GCC_OPT="-Os"
 NGX_GCC_OPT="-O"
 
-CFLAGS="$CFLAGS $NGX_GCC_OPT"
-
 #CFLAGS="$CFLAGS -fomit-frame-pointer"
 
 case $CPU in

auto/feature

@@ -39,7 +39,7 @@ END
 
 
 ngx_test="$CC $CC_TEST_FLAGS $CC_AUX_FLAGS $ngx_feature_inc_path \
-          -o $NGX_AUTOTEST $NGX_AUTOTEST.c $NGX_LD_OPT $ngx_feature_libs"
+          -o $NGX_AUTOTEST $NGX_AUTOTEST.c $NGX_TEST_LD_OPT $ngx_feature_libs"
 
 ngx_feature_inc_path=