[tlbuild] asymptote-2.56 in tl sources

[Nelson H. F. Beebe]

On Sun, 6 Oct 2019 14:04:44 -0600, Karl Berry announced new asymptote
code in the TeX Live source repository, so yesterday, I pulled down
snapshot texlive-20191007 and attempted a build with my usual script
on Ubuntu 18.04 x86-64.  That worked flawlessly.

However, when I ran the build of asymptote, I got link-time failure in
creating the asy executable:

	glew.o: In function `_glewInit_GL_VERSION_1_2':
	glew.c:(.text+0x474): undefined reference to `glXGetProcAddressARB'
	glew.c:(.text+0x48a): undefined reference to `glXGetProcAddressARB'
	glew.c:(.text+0x4ab): undefined reference to `glXGetProcAddressARB'
	glew.c:(.text+0x4c6): undefined reference to `glXGetProcAddressARB'
	glew.o: In function `_glewInit_GL_VERSION_1_3':
	glew.c:(.text+0x4ee): undefined reference to `glXGetProcAddressARB'
	glew.o:glew.c:(.text+0x504): more undefined references to `glXGetProcAddressARB' follow
	glew.o: In function `glxewGetExtension':
	glew.c:(.text+0xef1d): undefined reference to `glXGetClientString'
	glew.o: In function `glxewInit':
	glew.c:(.text+0xef75): undefined reference to `glXGetProcAddressARB'
	... many more ...

Here are the library references:

	% nm -D /usr/lib/x86_64-linux-gnu/libGLEW.so.1.13.0 |grep glXGetProcAddressARB
			 U glXGetProcAddressARB

	% nm -D /usr/lib/x86_64-linux-gnu/libGLX.so.0.0.0 | grep glXGetProcAddressARB
	00000000000066e0 T glXGetProcAddressARB

However, -lGLX is missing from the link command.

I restarted the asymptote build with

	cd texlive-20191007/source/utils/asymptote/
	make 'LIBS = $(LFLAGS) -lrt -lsigsegv -lz -lreadline -ltinfo -lncurses -lGL glew.o -lGLX $(GCLIBS)'

and that produced a successful link:

	% ./asy --version
	Asymptote version 2.56 [(C) 2004 Andy Hammerlindl, John C. Bowman, Tom Prince]

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- Nelson H. F. Beebe                    Tel: +1 801 581 5254                  -
- University of Utah                    FAX: +1 801 581 4148                  -
- Department of Mathematics, 110 LCB    Internet e-mail: beebe at math.utah.edu  -
- 155 S 1400 E RM 233                       beebe at acm.org  beebe at computer.org -
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