Avoid #include with inline function on C++Builder

Commit 6b2978406 exposed a bug with C++Builder's Clang-based compilers,
which cause inline function definitions in C translation units to not
be found by the linker. Disable the inclusion of the triggering header.

Reviewed-by: Paul Dale <pauli@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/15025)

e_os.h

@@ -108,7 +108,14 @@
         */
 #    include <winsock2.h>
 #    include <ws2tcpip.h>
-#    include <wspiapi.h>
+       /*
+        * Clang-based C++Builder 10.3.3 toolchains cannot find C inline
+        * definitions at link-time.  This header defines WspiapiLoad() as an
+        * __inline function.  https://quality.embarcadero.com/browse/RSP-33806
+        */
+#    if !defined(__BORLANDC__) || !defined(__clang__)
+#     include <wspiapi.h>
+#    endif
        /* yes, they have to be #included prior to <windows.h> */
 #   endif
 #   include <windows.h>