Bug 1619867 - Look for .exe-suffixed midl and rc from configure. r=dmajor

With this and all the previous changes, the necessary mozconfig for
local cross-builds only contains DIA_SDK_PATH, WINDOWSSDKDIR and
--target.

Differential Revision: https://phabricator.services.mozilla.com/D65295

--HG--
extra : moz-landing-system : lando

browser/config/mozconfigs/win64/cross

@@ -28,8 +28,6 @@ if [ -d "${CLANG_CL_EXE_DIR}" ]; then
     chmod +x "${CLANG_CL_EXE_DIR}/clang-cl.exe"
 fi
 export WINE=${MOZ_FETCHES_DIR}/wine/bin/wine64
-export RC=rc.exe
-export MIDL=midl.exe
 mk_add_options "export PATH=${TOOLTOOL_DIR}/vs2017_15.8.4/VC/bin/Hostx64/x64:${MOZ_FETCHES_DIR}/nsis-3.01:${CLANG_CL_EXE_DIR}:${PATH}"
 
 unset VC_PATH

build/moz.configure/toolchain.configure

@@ -2426,7 +2426,7 @@ def rc_names(c_compiler, toolchain_prefix):
     if c_compiler.type in ('gcc', 'clang'):
         return tuple('%s%s' % (p, 'windres')
                      for p in ('',) + (toolchain_prefix or ()))
-    return ('rc',)
+    return ('rc.exe',)
 
 
 check_prog('RC', rc_names, paths=sdk_bin_path, when=target_is_windows)

toolkit/moz.configure

@@ -1138,7 +1138,7 @@ def midl_names(c_compiler, toolchain_prefix):
             widl = prefixed + widl
         return widl
 
-    return ('midl',)
+    return ('midl.exe',)
 
 @depends(target, '--enable-compile-environment')
 def check_for_midl(target, compile_environment):