libevent2's cmake use absolute path, then cmake cannot find it when cross compiling:
```
-- Found libevent include directory: /builder/staging_dir/target-mips_24kc_musl/usr/include
-- Found libevent component: /builder/staging_dir/target-mips_24kc_musl/usr/lib/libevent_core.so
-- Found libevent component: /builder/staging_dir/target-mips_24kc_musl/usr/lib/libevent_extra.so
-- Found libevent component: /builder/staging_dir/target-mips_24kc_musl/usr/lib/libevent_openssl.so
-- Found libevent 2.1.12 in /builder/staging_dir/target-mips_24kc_musl/usr
CMake Error at /builder/staging_dir/target-mips_24kc_musl/usr/lib/cmake/libevent/LibeventTargets-shared.cmake:102 (message):
The imported target "libevent::core" references the file
"/usr/lib/libevent_core-2.1.so.7.0.1"
but this file does not exist. Possible reasons include:
* The file was deleted, renamed, or moved to another location.
* An install or uninstall procedure did not complete successfully.
* The installation package was faulty and contained
"/builder/staging_dir/target-mips_24kc_musl/usr/lib/cmake/libevent/LibeventTargets-shared.cmake"
but not all the files it references.
Call Stack (most recent call first):
/builder/staging_dir/target-mips_24kc_musl/usr/lib/cmake/libevent/LibeventConfig.cmake:168 (include)
CMakeLists.txt:34 (find_package)
```
This patch make cmake use relative imported path, so it can find libevent.
Signed-off-by: Liu Dongmiao <liudongmiao@gmail.com>
