Update config.h.win32(.in)
Update config.h.win32(.in)

Make it more like the one that is generated by autotools.

It is true that Visual C++ has sig_atomic_t, at least for Visual C++ 2008
and later, but this is currently only used for UNIX builds of GLib, as a
point of note here.

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