Pass GDCFLAGS and CCASFLAGS to libphobos subdirs

[Rainer Orth]

When trying to rebuild libphobos with -g3 -O0 for better debugging, I
noticed that GDCFLAGS weren't passed down as expected.  It turned out
that they are missing from AM_MAKEFLAGS.  After I fixed this, the only
file still compiled with -g -O2 was libdruntime/core/threadasm.S, so I
added CCASFLAGS, too.

Tested on i386-pc-solaris2.11.  Ok for mainline?

	Rainer

-- 
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Rainer Orth, Center for Biotechnology, Bielefeld University


2018-12-06  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

	* Makefile.am (AM_MAKEFLAGS): Pass CCASFLAGS, GDCFLAGS.
	* Makefile.in: Regenerate.

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