Change __BORLANDC__ to BOOST_BORLANDC, which is defined in Boost config for the Embarcadero non-clang-based compilers. (#48)

Co-authored-by: Edward Diener <eldlistmailingz@tropicsoft.com>

test/lambda_args.cpp

@@ -38,7 +38,7 @@ MPL_TEST_CASE()
     AUX_LAMBDA_TEST( int& );
     AUX_LAMBDA_TEST( int* );
 #if !BOOST_WORKAROUND(BOOST_MPL_CFG_GCC, <= 0x0295) \
-    && !BOOST_WORKAROUND(__BORLANDC__, < 0x600)
+    && !BOOST_WORKAROUND(BOOST_BORLANDC, < 0x600)
     AUX_LAMBDA_TEST( int[] );
 #endif
     AUX_LAMBDA_TEST( int[10] );