Add testing for `ppc64le` and `arm` architectures on Travis

Fix `arm` floating-point status register code

* Use an actual compiler definition to determine whether we have a
floating-point unit or not.

* Use a modern (VFPU) assembly instruction to get/set

Fix `arm` floating-point status register code

* Use an actual compiler definition to determine whether we have a
floating-point unit or not.

* Use a modern (VFPU) assembly instruction to get/set the fpsr

* If we don't have an fpsr, at least zero out the return value

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Cleanup `ARCH` handling, reorganize `AArch64` and `Make.inc`.

* Previously, behavior differed if the same value of `ARCH` was defined
within `Make.inc` or defined on the command line. Don't do th

Cleanup `ARCH` handling, reorganize `AArch64` and `Make.inc`.

* Previously, behavior differed if the same value of `ARCH` was defined
within `Make.inc` or defined on the command line. Don't do that.

* Provide saner defaults for `ARCH` and `MARCH`, and more importantly,
allow for the proper overriding of both.

* Split `AArch64` code further away from the other `arm` code.

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Merge pull request #146 from twadleigh/dll-a-for-windows

Version bump for Makefile change.

Version bump for Makefile change.

Merge pull request #145 from twadleigh/dll-a-for-windows

Generate libopenlibm.dll.a for windows.

Generate libopenlibm.dll.a for windows.

Merge pull request #133 from JuliaLang/sf/clang_on_linux

[WIP] Test linux clang on Travis

Fix invalid assembly directive caught by clang

Similar to the x86_64 changes a while back

Bump version for Makefile change.

Merge pull request #142 from JuliaLang/sf/cflags

Set optimization level only if not already overridden

Set optimization level only if not already overridden

BUMP VERSION

Restore the optimization level to -O3 by default.

Try adding a matrix build for `clang` on linux

Use `__clang__` as identifying mark of `clang` insted of `USECLANG`

Bump `ulp` limits higher for Travis tests

Re-enabled OSX tests

Remove floating-point exception checks when compiling with `clang`

Modify Openlibm maximum ulp definitions for clang

Merge pull request #140 from arjenroodselaar/split-install-target

Split install into subtargets

Split install into subtargets

When building a cross-compile toolchain for a freestanding platform one may not
want to build and install shared objects.

Merge pull request #141 from arjenroodselaar/fix-arm-decls

Include missing decls for ARM

Include missing decls for ARM

Merge pull request #139 from petercolberg/travis

Test Linux amd64/i686/arm64