osdep: work around Coverity parsing errors

Coverity does not like the new _Float* types that are used by
recent glibc, and croaks on every single file that includes
stdlib.h.  Add dummy typedefs to please it.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

include/qemu/osdep.h

@@ -33,6 +33,21 @@
 #else
 #include "exec/poison.h"
 #endif
+#ifdef __COVERITY__
+/* Coverity does not like the new _Float* types that are used by
+ * recent glibc, and croaks on every single file that includes
+ * stdlib.h.  These typedefs are enough to please it.
+ *
+ * Note that these fix parse errors so they cannot be placed in
+ * scripts/coverity-model.c.
+ */
+typedef float _Float32;
+typedef double _Float32x;
+typedef double _Float64;
+typedef __float80 _Float64x;
+typedef __float128 _Float128;
+#endif
+
 #include "qemu/compiler.h"
 
 /* Older versions of C++ don't get definitions of various macros from