Add private prototype for g_thread_init_glib()
Add private prototype for g_thread_init_glib()

This function was never put in a header and was only used internally
from libgthread, but we should keep the symbol around to avoid
triggering any false-positives on ABI checkers.

For -Wmissing-prototypes compatibility with this unusual case, we should
add a private prototype in the .c file just before.

Distrotech/glib,darren-clark/android_platform_external_bluetooth_glib,tchakabam/glib,iConsole/Console-OS_external_bluetooth_glib,johne53/MB3Glib,cention-sany/glib,mzabaluev/glib,darren-clark/android_platform_external_bluetooth_glib,Distrotech/glib,pstglia/platform-external-bluetooth-glib,lukasz-skalski/glib,MathieuDuponchelle/glib,justinkb/aosp-bluez.glib,MathieuDuponchelle/glib,tamaskenez/glib,MathieuDuponchelle/glib,mzabaluev/glib,johne53/MB3Glib,tamaskenez/glib,endlessm/glib,krichter722/glib,cosimoc/glib,darren-clark/android_platform_external_bluetooth_glib,pstglia/platform-external-bluetooth-glib,MathieuDuponchelle/glib,djdeath/glib,justinkb/aosp-bluez.glib,pstglia/platform-external-bluetooth-glib,01org/android-bluez-glib,endlessm/glib,ieei/glib,cention-sany/glib,djdeath/glib,iConsole/Console-OS_external_bluetooth_glib,djdeath/glib,bluez-android/glib,Distrotech/glib,Distrotech/glib,bluez-android/glib,johne53/MB3Glib,lukasz-skalski/glib,tchakabam/glib,cosimoc/glib,mzabaluev/glib,tamaskenez/glib,gale320/glib,pstglia/external-bluetooth-glib,cention-sany/glib,justinkb/aosp-bluez.glib,krichter722/glib,justinkb/aosp-bluez.glib,pstglia/external-bluetooth-glib,ieei/glib,lukasz-skalski/glib,Distrotech/glib,pstglia/external-bluetooth-glib,bluez-android/glib,antono/glib,pstglia/platform-external-bluetooth-glib,lukasz-skalski/glib,01org/android-bluez-glib,mzabaluev/glib,krichter722/glib,iConsole/Console-OS_external_bluetooth_glib,tchakabam/glib,antono/glib,pstglia/platform-external-bluetooth-glib,tchakabam/glib,johne53/MB3Glib,endlessm/glib,lukasz-skalski/glib,ieei/glib,johne53/MB3Glib,cention-sany/glib,djdeath/glib,tamaskenez/glib,krichter722/glib,pstglia/external-bluetooth-glib,justinkb/aosp-bluez.glib,gale320/glib,mzabaluev/glib,iConsole/Console-OS_external_bluetooth_glib,darren-clark/android_platform_external_bluetooth_glib,antono/glib,antono/glib,tchakabam/glib,ieei/glib,cosimoc/glib,gale320/glib,iConsole/Console-OS_external_bluetooth_glib,01org/android-bluez-glib,johne53/MB3Glib,ieei/glib,bluez-android/glib,krichter722/glib,endlessm/glib,gale320/glib,cosimoc/glib,endlessm/glib,pstglia/external-bluetooth-glib,cosimoc/glib,tamaskenez/glib,01org/android-bluez-glib,MathieuDuponchelle/glib,cention-sany/glib,darren-clark/android_platform_external_bluetooth_glib,bluez-android/glib,gale320/glib,01org/android-bluez-glib,djdeath/glib