qtbase: use PACKAGECONFIG to ensure runtime dependency to libssl

Using openssl-linked configure has side effect that gdb catches the SIGILL
signal, which openssl uses internally on ARM, every time when starting
debugging any Qt application. This is annoying and somewhat confusing
behavior even with QtCreator.

Using the default openssl configure argument prevents this, while using
the 4th argument for PACKAGECONFIG keeps the runtime dependency to libssl
correctly in place.

Change-Id: I3eb33ffc08980565930169710ed81de5fd4e0aa8
Reviewed-by: Teemu Holappa <teemu.holappa@theqtcompany.com>

recipes-qt/qt5/qtbase_git.bbappend

@@ -46,3 +46,6 @@ do_configure_prepend() {
 }
 
 SRCREV = "3880f41e683f02b905c8cbc3c578c3f3a0a1eb2e"
+
+# Temporarily here, until merged upstream
+PACKAGECONFIG[openssl] = "-openssl,-no-openssl,openssl,libssl"