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Remove `TRACE_PARSER` support

Attempting to build with this gave an "undefined reference to `yydebug'"
error (maybe a version issue with bison?), and I don't think it's been
used for recent parser debugging either.

--- a/CMakeLists.txt

+++ b/CMakeLists.txt

@@ -25,7 +25,6 @@

 option(SANITIZERS "Build with sanitizers enabled" OFF) # Ignored on MSVC

 option(MORE_WARNINGS "Turn on more warnings" OFF) # Ignored on MSVC

-option(TRACE_PARSER "Trace parser execution" OFF)

 if(MSVC)

   # MSVC's standard library triggers warning C5105,

@@ -87,8 +86,4 @@

   else()

     message(CHECK_FAIL "no")

   endif()

-endif()

-

-if(TRACE_PARSER)

-  target_compile_definitions(rgbasm PRIVATE -DYYDEBUG)

 endif()

--- a/src/asm/main.c

+++ b/src/asm/main.c

@@ -52,10 +52,6 @@

 // Unfortunately, macOS still ships 2.3, which is from 2008...

 int yyparse(void);

-#if defined(YYDEBUG) && YYDEBUG

-extern int yydebug;

-#endif

-

 FILE * dependfile;

 bool generatedMissingIncludes;

 bool failedOnMissingInclude;

@@ -160,10 +156,6 @@

 		now = (time_t)strtoul(sourceDateEpoch, NULL, 0);

 	dependfile = NULL;

-

-#if defined(YYDEBUG) && YYDEBUG

-	yydebug = 1;

-#endif

 	// Perform some init for below

 	sym_Init(now);