Make feature tests build with -Wall -Werror

The feature tests had a number of unused variables.
Make them appear used by doing a void cast.

Signed-off-by: Daniel Axtens <dja@axtens.net>

diff --git a/configure b/configure
index 53187203f52e727d3a717347da2ffc9186da61bd..93bbce2c9363873b9a24ba51d6c7154cd77ebc27 100755 (executable)
--- a/configure
+++ b/configure
@@ -528,6 +528,7 @@ int main(void)
 {
     unsigned int zero = 0;
     long test = __builtin_ctzl(zero);
+    (void)test;
     return 0;
 }
 EOF
@@ -545,6 +546,7 @@ cat > $test.c << EOF
 int main(void)
 {
     __m128i zero = _mm_setzero_si128();
+    (void)zero;
     return 0;
 }
 EOF
@@ -565,6 +567,7 @@ int main(void)
     __m128i a = _mm_setzero_si128();
     __m128i b = _mm_setzero_si128();
     __m128i c = _mm_clmulepi64_si128(a, b, 0x10);
+    (void)c;
     return 0;
 }
 EOF