apr: clean up the patches + enable LFS

- removes 001-autoconf-compat.patch:
  Looks like this was meant as a workaround for a libtool issue. But it
  doesn't appear to be needed anymore.
- removes 101-fix_apr_time_now.patch:
  Mentioned in https://dev.openwrt.org/ticket/9287, meant as a fix, but
  issue was fixed differently in the end (by activating LFS).
- removes 201-upgrade-and-fix-1.5.1.patch:
  This is a cross-compile fix. This patch gets replaced by
  001-cross-compile.patch from buildroot project. The latter was sent
  upstream by buildroot and is in line with the patch used by OpenWrt
  for the apache package.
- adds 002-sys-param-h.patch:
  Fix PATH_MAX detection by including sys/param.h if available. Also
  from buildroot.

Additionally configure variables found in buildroot package are added.
These also enable LFS support. This was previously done (in OpenWrt) by
defining _LARGEFILE64_SOURCE in TARGET_CPPFLAGS. But the configure
variable is cleaner (and easier to follow).

Signed-off-by: Sebastian Kemper <sebastian_ml@gmx.net>

libs/apr/patches/001-cross-compile.patch

@@ -0,0 +1,56 @@
+Fix cross-compilation
+
+Patch was backported from Apache httpd:
+http://svn.apache.org/viewvc?view=revision&revision=1327907
+http://svn.apache.org/viewvc?view=revision&revision=1328390
+http://svn.apache.org/viewvc?view=revision&revision=1328714
+
+Patch submitted upstream:
+https://issues.apache.org/bugzilla/show_bug.cgi?id=57058
+
+Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
+
+--- a/configure.in
++++ b/configure.in
+@@ -118,6 +118,16 @@ AC_CANONICAL_SYSTEM
+ echo "Configuring APR library"
+ echo "Platform: $host"
+ 
++dnl In case of cross compilation we set CC_FOR_BUILD to cc unless
++dnl we got already CC_FOR_BUILD from environment.
++if test "x${build_alias}" != "x${host_alias}"; then
++  if test "x${CC_FOR_BUILD}" = "x"; then
++    CC_FOR_BUILD=cc
++  fi
++fi
++AC_SUBST(CC_FOR_BUILD)
++AC_SUBST(CFLAGS_FOR_BUILD)
++
+ dnl Some initial steps for configuration.  We setup the default directory
+ dnl and which files are to be configured.
+ 
+--- a/Makefile.in
++++ b/Makefile.in
+@@ -8,6 +8,8 @@ top_blddir=@apr_builddir@
+ # APR (Apache Portable Runtime) library Makefile.
+ #
+ CPP = @CPP@
++CC_FOR_BUILD = @CC_FOR_BUILD@
++CFLAGS_FOR_BUILD = @CFLAGS_FOR_BUILD@
+ 
+ # get substituted into some targets
+ APR_MAJOR_VERSION=@APR_MAJOR_VERSION@
+@@ -137,8 +139,13 @@ tools/gen_test_char.lo: tools/gen_test_c
+ 	$(APR_MKDIR) tools
+ 	$(LT_COMPILE)
+ 
++ifdef CC_FOR_BUILD
++tools/gen_test_char@EXEEXT@: tools/gen_test_char.c $(LOCAL_LIBS)
++	$(CC_FOR_BUILD) $(CFLAGS_FOR_BUILD) -DCROSS_COMPILE -o $@ $<
++else
+ tools/gen_test_char@EXEEXT@: $(OBJECTS_gen_test_char)
+ 	$(LINK_PROG) $(OBJECTS_gen_test_char) $(ALL_LIBS)
++endif
+ 
+ include/private/apr_escape_test_char.h: tools/gen_test_char@EXEEXT@
+ 	$(APR_MKDIR) include/private