Use i386 ieeefp.h from msun

[ViralBShah]

This should hopefully work on i686.

@nalimilan Can you try out this PR on i686? I do not have a 32-bit VM handy.

[nalimilan]

I get this error:

gcc  -O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -m32 -march=i686 -mtune=atom -fasynchronous-unwind-tables -fno-gnu89-inline -std=c99 -Wall -I/builddir/build/BUILD/openlibm-vs-i686 -I/builddir/build/BUILD/openlibm-vs-i686/include -I/builddir/build/BUILD/openlibm-vs-i686/ld80 -I/builddir/build/BUILD/openlibm-vs-i686/i387 -I/builddir/build/BUILD/openlibm-vs-i686/src -DASSEMBLER -D__BSD_VISIBLE -Wno-implicit-function-declaration -fPIC -c src/s_ccoshf.c -o src/s_ccoshf.c.o
In file included from src/s_cbrtl.c:28:0:
/builddir/build/BUILD/openlibm-vs-i686/i387/bsd_ieeefp.h:49:2: error: #error this file needs sys/cdefs.h as a prerequisite
 #error this file needs sys/cdefs.h as a prerequisite
  ^~~~~
Make.inc:66: recipe for target 'src/s_cbrtl.c.o' failed

https://kojipkgs.fedoraproject.org//work/tasks/4111/13114111/build.log

We should really set up Travis CI and AppVeyor.

[ViralBShah]

I need to setup a VM....