maint: fix some syntax-check issues.

* cfg.mk (local-checks-to-skip): Remove
	sc_prohibit_quotearg_without_use, sc_prohibit_strcmp,
	sc_unmarked_diagnostics, sc_useless_cpp_parens.
	(sc_unmarked_diagnostics): Skip DJGPP.
	* data/yacc.c, src/LR0.c, src/closure.c,
	* src/flex-scanner.h, src/gram.c, src/lalr.c,
	* src/print-xml.c, src/print.c, src/print_graph.c,
	* src/reader.c, src/reduce.c, src/tables.c:
	Don't use parens with cpp's defined.
	Remove useless includes.

src/LR0.c

@@ -26,7 +26,6 @@
 #include "system.h"
 
 #include <bitset.h>
-#include <quotearg.h>
 
 #include "LR0.h"
 #include "closure.h"

src/closure.c

@@ -24,7 +24,6 @@
 #include <bitset.h>
 #include <bitsetv-print.h>
 #include <bitsetv.h>
-#include <quotearg.h>
 
 #include "closure.h"
 #include "derives.h"

src/flex-scanner.h

@@ -51,11 +51,11 @@ int   FLEX_PREFIX (lex_destroy) (void);
    versions according to the Flex manual) leak memory if yylex_destroy is not
    invoked.  However, yylex_destroy is not defined before Flex 2.5.9, so give
    an implementation here that at least appears to work with Flex 2.5.4.  */
-#if !defined(YY_FLEX_MAJOR_VERSION) || YY_FLEX_MAJOR_VERSION < 2 \
+#if !defined YY_FLEX_MAJOR_VERSION || YY_FLEX_MAJOR_VERSION < 2 \
     || (YY_FLEX_MAJOR_VERSION == 2 \
-        && (!defined(YY_FLEX_MINOR_VERSION) || YY_FLEX_MINOR_VERSION < 5 \
+        && (!defined YY_FLEX_MINOR_VERSION || YY_FLEX_MINOR_VERSION < 5 \
             || (YY_FLEX_MINOR_VERSION == 5 \
-                && (!defined(YY_FLEX_SUBMINOR_VERSION) \
+                && (!defined YY_FLEX_SUBMINOR_VERSION \
                     || YY_FLEX_SUBMINOR_VERSION < 9))))
 # define yylex_destroy() yy_delete_buffer (YY_CURRENT_BUFFER)
 #endif

src/gram.c

@@ -21,8 +21,6 @@
 #include <config.h>
 #include "system.h"
 
-#include <quotearg.h>
-
 #include "complain.h"
 #include "getargs.h"
 #include "gram.h"

src/lalr.c

@@ -27,7 +27,6 @@
 
 #include <bitset.h>
 #include <bitsetv.h>
-#include <quotearg.h>
 
 #include "LR0.h"
 #include "complain.h"

src/print-xml.c

@@ -23,7 +23,6 @@
 #include <stdarg.h>
 
 #include <bitset.h>
-#include <quotearg.h>
 
 #include "LR0.h"
 #include "closure.h"

src/print.c

@@ -22,7 +22,6 @@
 #include "system.h"
 
 #include <bitset.h>
-#include <quotearg.h>
 
 #include "LR0.h"
 #include "closure.h"

src/print_graph.c

@@ -20,8 +20,6 @@
 #include <config.h>
 #include "system.h"
 
-#include <quotearg.h>
-
 #include "LR0.h"
 #include "closure.h"
 #include "complain.h"

src/reader.c

@@ -22,7 +22,6 @@
 #include "system.h"
 
 #include <quote.h>
-#include <quotearg.h>
 
 #include "complain.h"
 #include "conflicts.h"

src/reduce.c

@@ -29,7 +29,6 @@
 #include "system.h"
 
 #include <bitset.h>
-#include <quotearg.h>
 
 #include "complain.h"
 #include "files.h"

src/tables.c

@@ -22,7 +22,6 @@
 #include "system.h"
 
 #include <bitsetv.h>
-#include <quotearg.h>
 
 #include "complain.h"
 #include "conflicts.h"