GKeyFile: remove approximate_size optimisation
GKeyFile: remove approximate_size optimisation

This is micro-optimisation of the worst kind and it's causing obscure
bugs in edge cases.  Better just remove this entirely.

https://bugzilla.gnome.org/show_bug.cgi?id=634232

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