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.

Test: make clean && make
Change-Id: Ibc0fb9c8e412f8b46b1761359c34b64c608a06b6
1 file changed