gst-launch: Use gst_print* instead of g_print* to fix broken stdout on Windows

Concurrent Windows' colored debug message and g_print will print
string hard to read. Instead, use gst_print* which serialize
debug output and the APIs call.
28 jobs for fix-broken-string-windows in 141 minutes and 30 seconds (queued for 1 minute and 8 seconds)
Status Job ID Name Coverage
  Preparation
passed #517682
gst indent

00:00:35

passed #517681
manifest

00:00:39

 
  Build
passed #517691
build cerbero android universal

00:14:57

passed #517692
build cerbero cross win32

00:12:00

passed #517693
build cerbero cross win64

00:10:39

passed #517690
build cerbero fedora x86_64

00:09:18

manual #517695
gst-ios-12.2 allowed to fail manual
build cerbero ios universal
passed #517694
gst-macos-10.14
build cerbero macos x86_64

00:13:26

passed #517683
build fedora x86_64

00:07:45

passed #517689
docker windows 1607
build msys2

00:17:00

passed #517684
build nodebug fedora x86_64

00:05:41

passed #517685
build static fedora x86_64

00:13:07

passed #517686
build static nodebug fedora x86_64

00:12:47

passed #517687
docker windows 1607
build vs2017 amd64

00:12:03

passed #517688
docker windows 1607
build vs2017 x86

00:11:19

 
  Test
passed #518161
check fedora

00:05:20

passed #517697
integration testsuites fedora

00:56:26

passed #517702
valgrind bad

00:08:13

passed #517699
valgrind base

00:17:44

passed #517698
valgrind core

00:21:55

passed #517703
valgrind ges

00:10:05

passed #517700
valgrind good

00:26:35

passed #517701
valgrind ugly

00:02:49

failed #518139
check fedora

00:05:13

failed #518116
check fedora

00:04:03

failed #517696
check fedora

00:05:45

 
  Integrate
passed #517704
android universal examples

00:06:44

passed #517705
documentation

00:03:32