Conform to standard Makefile conventions.

TXR's build should use the values of standard make variables:
use the existing $(CC), $(CFLAGS), $(YACC), $(LDFLAGS) and
such.

* Makefile (TXR_CFLAGS): New variable. Initialized with the
value of $(CFLAGS) and then customized. Used everywhere
in place of CFLAGS.
(CFLAGS): Now used only as the initial value of TXR_CFLAGS; no
longer clobbered with the := assignment. Thus if a
distribution of free software builds everything with certain
CFLAGS, we incorporate those CFLAGS that it wants us to use.
(TXR_LDFLAGS): New variable, initialized from $(LDFLAGS).
Used in place of LDFLAGS.
(LDFLAGS): Use only, do not modify.
(NM): Replaced with TXR_NM.
(YACC): Replaced with TXR_YACC.

* configure (ccname): Default to $(CC) rather than gcc.
(lex): Default name portion $(LEX) rather than flex; keep
the optional prefixes.
(gen_config_make): Generate TXR_CC, TXR_LEX, TXR_YACC and
TXR_NM variables, rather than clobbering the standard ones
CC, LEX and YACC.
Also, in the rule that finds yacc, we now try '$(YACC)'
first.

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