Configure: use .exe for binaries for all win32 compilers.

auto/cc/bcc

diff --git a/auto/cc/bcc b/auto/cc/bcc
index ec82e60..e990a9f 100644
--- a/auto/cc/bcc
+++ b/auto/cc/bcc
@@ -62,7 +62,6 @@
 ngx_objout="-o"
 ngx_binout="-e"
 ngx_objext="obj"
-ngx_binext=".exe"
 
 ngx_long_start='@&&|
 	'

auto/cc/msvc

diff --git a/auto/cc/msvc b/auto/cc/msvc
index 4eef101..8257252 100644
--- a/auto/cc/msvc
+++ b/auto/cc/msvc
@@ -142,7 +142,6 @@
 ngx_objout="-Fo"
 ngx_binout="-Fe"
 ngx_objext="obj"
-ngx_binext=".exe"
 
 ngx_long_start='@<<
 	'

auto/cc/owc

diff --git a/auto/cc/owc b/auto/cc/owc
index a063aa3..f7fd88c 100644
--- a/auto/cc/owc
+++ b/auto/cc/owc
@@ -84,7 +84,6 @@
 ngx_objout="-fo"
 ngx_binout="-fe="
 ngx_objext="obj"
-ngx_binext=".exe"
 
 ngx_regex_dirsep='\\'
 ngx_dirsep="\\"

auto/os/win32

diff --git a/auto/os/win32 b/auto/os/win32
index 650cf49..7a82774 100644
--- a/auto/os/win32
+++ b/auto/os/win32
@@ -13,6 +13,7 @@
 SELECT_SRCS=$WIN32_SELECT_SRCS
 
 ngx_pic_opt=
+ngx_binext=".exe"
 
 case "$NGX_CC_NAME" in