Revert "Provide a floorl() function (which is currently only able to call GCC's __builtin_floorl() function) for systems which don't provide one." because I left off the new wsutil/floor.[ch] files

This reverts commit e2586ec36d.

Change-Id: Ie38b7f32b2d21e3beba5173eec22ca12b7f5da91
Reviewed-on: https://code.wireshark.org/review/5891
Reviewed-by: Stephen Fisher <sfisher@sdf.org>

configure.ac

@@ -2736,7 +2736,6 @@ AC_SUBST(STRPTIME_LO)
 AC_CHECK_FUNCS(getprotobynumber gethostbyname2)
 AC_CHECK_FUNCS(issetugid)
 AC_CHECK_FUNCS(mmap mprotect sysconf)
-AC_CHECK_FUNCS(floorl)
 
 dnl blank for now, but will be used in future
 AC_SUBST(wireshark_SUBDIRS)

ui/time_shift.c

@@ -33,8 +33,6 @@
 
 #include "ui/ui_util.h"
 
-#include "wsutil/floor.h"
-
 #define SHIFT_POS               0
 #define SHIFT_NEG               1
 #define SHIFT_SETTOZERO         1

wsutil/Makefile.common

@@ -51,7 +51,6 @@ LIBWSUTIL_SRC = 	\
 	des.c		\
 	eax.c		\
 	filesystem.c	\
-	floor.c		\
 	g711.c		\
 	glib_version_info.c \
 	md4.c		\
@@ -104,7 +103,6 @@ libwsutil_nonrepl_INCLUDES = \
 	des.h		\
 	eax.h		\
 	filesystem.h	\
-	floor.h		\
 	g711.h		\
 	glib_version_info.h \
 	md4.h		\