Fixed a build failure on Ubuntu 8.10 introduced by the patch

for bug #15936.

On some platforms fenv.h may #undef the min/max macros
defined in my_global.h.

Fixed by moving the #include directive for fenv.h from
mysqld.cc to my_global.h before definitions for min/max.

include/my_global.h:
  Moved #include <fenv.h> from mysqld.cc.
sql/mysqld.cc:
  Moved #include <fenv.h> to my_global.h.

include/my_global.h

@@ -324,6 +324,9 @@ C_MODE_END
 #ifdef HAVE_FLOAT_H
 #include <float.h>
 #endif
+#ifdef HAVE_FENV_H
+#include <fenv.h> /* For fesetround() */
+#endif
 
 #ifdef HAVE_SYS_TYPES_H
 #include <sys/types.h>

sql/mysqld.cc

@@ -187,9 +187,6 @@ int initgroups(const char *,unsigned int);
 typedef fp_except fp_except_t;
 #endif
 #endif /* __FreeBSD__ && HAVE_IEEEFP_H */
-#ifdef HAVE_FENV_H
-#include <fenv.h>
-#endif
 #ifdef HAVE_SYS_FPU_H
 /* for IRIX to use set_fpc_csr() */
 #include <sys/fpu.h>