fio: disable compiler optimizations

Pass parameter "--disable-optimizations" to
configure script to disable compiler optimizations
to fix below issue:
$ gdb /usr/bin/fio
(gdb) r -h
Starting program: /usr/bin/fio -h
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".

Program received signal SIGILL, Illegal instruction.
0x0000000000407220 in prio_tree_init () at lib/prio_tree.c:61
 61	index_bits_to_maxindex[i] = (1UL << (i + 1)) - 1;
(gdb) bt
 #0 0x0000000000407220 in prio_tree_init () at lib/prio_tree.c:61
 #1 0x0000000000482208 in __libc_csu_init (argc=argc@entry=2,
    argv=argv@entry=0x7fffffffecc8, envp=0x7fffffffece0)
    at /usr/src/debug/glibc/2.26-r0/git/csu/elf-init.c:88
 openembedded#2 0x00000031c742095e in __libc_start_main (main=0x407700 <main>, argc=2,
    argv=0x7fffffffecc8, init=0x4821b6 <__libc_csu_init>,
    fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffffffecb8)
    at /usr/src/debug/glibc/2.26-r0/git/csu/libc-start.c:264
 openembedded#3 0x00000000004077ea in _start () at ../sysdeps/x86_64/start.S:120

Signed-off-by: Mingli Yu <Mingli.Yu@windriver.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-oe/recipes-benchmark/fio/fio_3.8.bb

@@ -32,6 +32,7 @@ S = "${WORKDIR}/git"
 DISABLE_STATIC = ""
 
 EXTRA_OEMAKE = "CC='${CC}' LDFLAGS='${LDFLAGS}'"
+EXTRA_OECONF = "--disable-optimizations"
 
 do_configure() {
     ./configure ${EXTRA_OECONF}