target-xtensa: fix missing errno codes for mingw32

Put the following errno value mappings under #ifdef:

xtensa-semi.c: In function 'errno_h2g':
xtensa-semi.c:113: error: 'ENOTBLK' undeclared (first use in this function)
xtensa-semi.c:113: error: (Each undeclared identifier is reported only once
xtensa-semi.c:113: error: for each function it appears in.)
xtensa-semi.c:113: error: array index in initializer not of integer type
xtensa-semi.c:113: error: (near initialization for 'guest_errno')
xtensa-semi.c:124: error: 'ETXTBSY' undeclared (first use in this function)
xtensa-semi.c:124: error: array index in initializer not of integer type
xtensa-semi.c:124: error: (near initialization for 'guest_errno')
xtensa-semi.c:134: error: 'ELOOP' undeclared (first use in this function)
xtensa-semi.c:134: error: array index in initializer not of integer type
xtensa-semi.c:134: error: (near initialization for 'guest_errno')
Signed-off-by: NMax Filippov <jcmvbkbc@gmail.com>
Signed-off-by: NBlue Swirl <blauwirbel@gmail.com>

target-xtensa/xtensa-semi.c

@@ -110,7 +110,9 @@ static uint32_t errno_h2g(int host_errno)
         [ENOMEM]        = TARGET_ENOMEM,
         [EACCES]        = TARGET_EACCES,
         [EFAULT]        = TARGET_EFAULT,
+#ifdef ENOTBLK
         [ENOTBLK]       = TARGET_ENOTBLK,
+#endif
         [EBUSY]         = TARGET_EBUSY,
         [EEXIST]        = TARGET_EEXIST,
         [EXDEV]         = TARGET_EXDEV,
@@ -121,7 +123,9 @@ static uint32_t errno_h2g(int host_errno)
         [ENFILE]        = TARGET_ENFILE,
         [EMFILE]        = TARGET_EMFILE,
         [ENOTTY]        = TARGET_ENOTTY,
+#ifdef ETXTBSY
         [ETXTBSY]       = TARGET_ETXTBSY,
+#endif
         [EFBIG]         = TARGET_EFBIG,
         [ENOSPC]        = TARGET_ENOSPC,
         [ESPIPE]        = TARGET_ESPIPE,
@@ -131,7 +135,9 @@ static uint32_t errno_h2g(int host_errno)
         [EDOM]          = TARGET_EDOM,
         [ERANGE]        = TARGET_ERANGE,
         [ENOSYS]        = TARGET_ENOSYS,
+#ifdef ELOOP
         [ELOOP]         = TARGET_ELOOP,
+#endif
     };
 
     if (host_errno == 0) {