run scripts: don't use is_qemu_available anymore

With the new run tool, there is no more is_qemu_available function. However,
some scripts still try to use it because only frequently used scripts were
updated by now. The commit replaces the function calls with the new
'have_include power_on/qemu' check.

Ref #1419

repos/dde_linux/run/usb_terminal.run

@@ -1,7 +1,7 @@
 #
 # Check if USB_RAW_DEVICE is set for Qemu
 #
-if {![info exists ::env(USB_RAW_DEVICE)] && [is_qemu_available]} {
+if {![info exists ::env(USB_RAW_DEVICE)] && [have_include power_on/qemu]} {
 	puts "\nPlease define USB_RAW_DEVICE environment variable and set it to your USB device <bus.device>\n"
 	exit 0
 }

repos/libports/run/libc_block.run

@@ -7,7 +7,7 @@ if {[have_spec linux]} {
 if {[expr [have_spec 64bit] && $use_atapi_drv]} {
 	puts "ATAPI driver does not support 64 bit."; exit 0 }
 
-if {![is_qemu_available]} {
+if {![have_include power_on/qemu]} {
 	puts "\nPlease setup your native sd or hard drive. Remove this fail stop";
 	puts "check when you have prepared your native environment.\n";
 	exit 0

repos/ports/run/seoul-disc.run

@@ -27,7 +27,7 @@ set vcpus_to_be_used  1
 
 source ${genode_dir}/repos/ports/run/seoul.inc
 
-if {[is_qemu_available]} {
+if {[have_include power_on/qemu]} {
 
 	if {![file exists bin/seoul-disc.raw]} {
 		puts "Please provide a disk image file to  bin/seoul-disc.raw"

repos/ports/run/seoul-kernelbuild.run

@@ -9,7 +9,7 @@
 
 assert_spec nova
 
-if {[is_qemu_available]} {
+if {[have_include power_on/qemu]} {
 	puts "\nAuto test running on Qemu is not recommended.\n"
 	exit
 }