Remove phpdbg parser files generated by bison

The parser files for phpdbg are generated by bison from the *.y file.
Parser files in Zend already follows such approach of these files being
ignored from tracking in the Git repository and they are shipped via
the release packages. This way the end user still don't need to have
bison dependency installed to install PHP.

The genfiles script was refactored to generate the phpdbg parser and lexer
files.

Empty comment in phpdbg parser y template file has been changed to the
YACC compliant /* empty */ instead of custom one.

Author: petk

Diff for: genfiles

@@ -9,10 +9,14 @@ if [ -z $RE2C ]; then
   RE2C="re2c"
 fi
 
+# Generate Zend parser and lexer files
 STD="make -f Zend/Makefile.frag RE2C='$RE2C' RE2C_FLAGS='-i' YACC='$YACC' srcdir=Zend builddir=Zend top_srcdir=."
-
 (eval "$STD Zend/zend_language_parser.c Zend/zend_language_scanner.c Zend/zend_ini_parser.c Zend/zend_ini_scanner.c")
 
+# Generate phpdbg parser and lexer files
+STD="make -f sapi/phpdbg/Makefile.frag RE2C='$RE2C' RE2C_FLAGS='-i' YACC='$YACC' srcdir=sapi/phpdbg builddir=sapi/phpdbg top_srcdir=."
+(eval "$STD sapi/phpdbg/phpdbg_parser.c sapi/phpdbg/phpdbg_lexer.c")
+
 set -x
 
 CLEANUP_FILES=" \