apr: upgrade to 1.5.1

apr: upgrade to 1.5.1

The LICENSE has no change, except a newline added.

Fix do_compile failed:
| tools/gen_test_char > include/private/apr_escape_test_char.h
| /bin/sh: tools/gen_test_char: No such file or directory
| make[1]: *** [include/private/apr_escape_test_char.h] Error 127

The tools/gen_test_char was invoked at build time, and it didn't
work for the cross compiling, so we built it with $BUILD_CC.

To make sure there was no side effect on the change, not adding this
patch, I did the test:

1. Built the native tools/gen_test_char on x86-64 host, and invoke
   it on that host;

2. Built the target tools/gen_test_char which arch was arm, and invoke
   it on the qemuarm;

3. Comparing the results, they were total the same;
...
/* this file is automatically generated by gen_test_char, do not edit. "make include/private/apr_escape_test_char.h" to regenerate. */

static const unsigned char test_char_table[256] = {
    32,30,30,30,30,30,30,30,30,30,31,30,30,30,30,30,30,30,30,30,
    30,30,30,30,30,30,30,30,30,30,30,30,6,16,63,22,17,22,49,17,
    17,17,1,16,16,0,0,18,0,0,0,0,0,0,0,0,0,0,16,23,
    55,16,55,23,16,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
    0,0,0,0,0,0,0,0,0,0,0,23,31,23,23,0,23,0,0,0,
    0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
    0,0,0,23,23,23,17,30,30,30,30,30,30,30,30,30,30,30,30,30,
    30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,
    30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,
    30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,
    30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,
    30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,
    30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30
};
...

Fix do_install failed:
| DEBUG: Executing shell function do_install
| NOTE: make -j 16 DESTDIR=tmp/work/x86_64-linux/apr-native/1.5.1-r0/image
 install
| tmp/work/x86_64-linux/apr-native/1.5.1-r0/apr-1.5.1/build/mkdir.sh tools
| gcc  -isystem/home/pokybuild/yocto-autobuilder/yocto-slave/build-appliance/
build/build/tmp/sysroots/x86_64-linux/usr/include -O2 -pipe
tools/gen_test_char.c -o tools/gen_test_char
| make[1]: Entering directory `tmp/work/x86_64-linux/apr-native/1.5.1-r0/
apr-1.5.1'
| tmp/work/x86_64-linux/apr-native/1.5.1-r0/apr-1.5.1/build/mkdir.sh tools
| gcc  -isystem/home/pokybuild/yocto-autobuilder/yocto-slave/build-appliance/
build/build/tmp/sysroots/x86_64-linux/usr/include -O2 -pipe
tools/gen_test_char.c -o tools/gen_test_char
| tmp/work/x86_64-linux/apr-native/1.5.1-r0/apr-1.5.1/build/mkdir.sh
include/private
| tools/gen_test_char > include/private/apr_escape_test_char.h
| /bin/sh: tools/gen_test_char: Permission denied

Remove the 'tools' dir creation, it always existed. And it caused
gen_test_char unexpected rebuilt at do_install time.

Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>