uninorm tests: Fix compilation error on Cygwin

[Bruno Haible]

When compiling a testdir for all of Gnulib, on Cygwin, with libunistring
preinstalled, I get compilation errors such as:

In file included from ../../gltests/uninorm/test-nfc.c:21:0:
/usr/local/cygwin64/include/uninorm.h:130:21: error: initializer element is not 
constant
 #define UNINORM_NFC (&uninorm_nfc)
                     ^
../../gltests/uninorm/test-nfc.c:25:15: note: in expansion of macro 
'UNINORM_NFC'
 uninorm_t n = UNINORM_NFC;
               ^~~~~~~~~~~
make[4]: *** [Makefile:21689: uninorm/test-nfc.o] Error 1

This patch fixes it.


2021-01-18  Bruno Haible  <bruno@clisp.org>

        uninorm tests: Fix compilation error on Cygwin.
        * tests/uninorm/test-nfc.c (n): Don't define when using a preinstalled
        libunistring on Windows.
        * tests/uninorm/test-nfd.c (n): Likewise.
        * tests/uninorm/test-nfkc.c (n): Likewise.
        * tests/uninorm/test-nfkd.c (n): Likewise.

diff --git a/tests/uninorm/test-nfc.c b/tests/uninorm/test-nfc.c
index 0e90834..0a7d857 100644
--- a/tests/uninorm/test-nfc.c
+++ b/tests/uninorm/test-nfc.c
@@ -20,7 +20,7 @@
 
 #include "uninorm.h"
 
-#if !(WOE32DLL || defined __ANDROID__)
+#if !(((defined _WIN32 || defined __CYGWIN__) && (HAVE_LIBUNISTRING || 
WOE32DLL)) || defined __ANDROID__)
 /* Check that UNINORM_NFC is defined and links.  */
 uninorm_t n = UNINORM_NFC;
 #endif
diff --git a/tests/uninorm/test-nfd.c b/tests/uninorm/test-nfd.c
index 63a40f9..e5a06bc 100644
--- a/tests/uninorm/test-nfd.c
+++ b/tests/uninorm/test-nfd.c
@@ -20,7 +20,7 @@
 
 #include "uninorm.h"
 
-#if !(WOE32DLL || defined __ANDROID__)
+#if !(((defined _WIN32 || defined __CYGWIN__) && (HAVE_LIBUNISTRING || 
WOE32DLL)) || defined __ANDROID__)
 /* Check that UNINORM_NFD is defined and links.  */
 uninorm_t n = UNINORM_NFD;
 #endif
diff --git a/tests/uninorm/test-nfkc.c b/tests/uninorm/test-nfkc.c
index 0505319..52709d7 100644
--- a/tests/uninorm/test-nfkc.c
+++ b/tests/uninorm/test-nfkc.c
@@ -20,7 +20,7 @@
 
 #include "uninorm.h"
 
-#if !(WOE32DLL || defined __ANDROID__)
+#if !(((defined _WIN32 || defined __CYGWIN__) && (HAVE_LIBUNISTRING || 
WOE32DLL)) || defined __ANDROID__)
 /* Check that UNINORM_NFKC is defined and links.  */
 uninorm_t n = UNINORM_NFKC;
 #endif
diff --git a/tests/uninorm/test-nfkd.c b/tests/uninorm/test-nfkd.c
index 1e20d9a..5e374e3 100644
--- a/tests/uninorm/test-nfkd.c
+++ b/tests/uninorm/test-nfkd.c
@@ -20,7 +20,7 @@
 
 #include "uninorm.h"
 
-#if !(WOE32DLL || defined __ANDROID__)
+#if !(((defined _WIN32 || defined __CYGWIN__) && (HAVE_LIBUNISTRING || 
WOE32DLL)) || defined __ANDROID__)
 /* Check that UNINORM_NFKD is defined and links.  */
 uninorm_t n = UNINORM_NFKD;
 #endif