build: use feenableexcept only on glibc

feenableexcept is a GNU extention and is not part of the standard. For
example, musl libc does not implement it.

Signed-off-by: omcaif <[email protected]>

Author: omcaif

src/libOpenImageIO/imageinout_test.cpp

@@ -537,7 +537,7 @@ main(int argc, char* argv[])
     getargs(argc, argv);
 
     if (enable_fpe) {
-#if defined(__linux__)
+#if defined(__GLIBC__)
         fprintf(stderr, "Enable floating point exceptions.\n");
         feenableexcept(FE_DIVBYZERO | FE_INVALID | FE_OVERFLOW);
 #else