etc/autobuild/ab3_defcfg: set cmake build type to RelWithDebInfo

As now we require ELF files inside a package to contain debug info to
strip to debug symbol packages, set cmake build type to RelWithDebInfo
to let CMake insert -g to generate debug info.

Signed-off-by: Icenowy Zheng <icenowy@aosc.io>

Author: Icenowy

etc/autobuild/ab3_defcfg.sh

@@ -122,7 +122,7 @@ AUTOTOOLS_DEF="""
 """
 CMAKE_DEF="""
 	-DCMAKE_INSTALL_PREFIX=$PREFIX
-	-DCMAKE_BUILD_TYPE=Release
+	-DCMAKE_BUILD_TYPE=RelWithDebInfo
 	-DCMAKE_INSTALL_LIBDIR=lib
 	-DLIB_INSTALL_DIR=lib
 	-DSYSCONF_INSTALL_DIR=$SYSCONF