Remove unused get-package-min-sdk-version-int

The only user of get-package-min-sdk-version-int was signapk. signapk
no longer needs to be provided with the APK's minSdkVersion though.

(cherry picked from commit e185da21ca07006c5ced90e1577c0682566428de)
Test: make clean && make

Change-Id: I6867a004aec0f3752cbbc99cc30e02ca5404b3c4
1 file changed