Revert silly version changes I made earlier

Commits:
Revert "all: Only use major version for pkgconfig"
Revert "libtracker-miner: Fix PkgConfig "Requires", juse major version number only"

This reverts commit 9ebf1aa756c408ab91bda59e3f9e2fce85a1e4a1.
This reverts commit a5fcbc1467184c06937fd81ba455f2ea1c1de0ca.
This reverts commit 3417e2464f81a4158dfa50d954f704745daecf6d.
build: Don't use API version 1.2, only the major/minor version should

This avoids broken library and pkgconfig versions