don't override dir() in qa rpc tests

Replace "dir" with "dirname" in util.py in qa/rpc-tests/ because "dir"
is the name of a function in python.
[Qt] Fix height of BitcoinAmountField
Merge pull request #5287

7335ca1 [Qt] Fix height of BitcoinAmountField (Cozz Lovan)
[OSX, docs] update some release build informations

- switching release builds to 10.7
- release binary looks like 64bit only
- tested up to 10.10
- gitian builder builds against 10.7. The docs should be consistant.
- remove 32bit text because nowadays it's obvious to support 64bit only on OSX.
Merge pull request #5282

a7af983 don't override dir() in qa rpc tests (Bryan Bishop)
Squashed 'src/secp256k1/' content from commit c48cdc4

git-subtree-dir: src/secp256k1
git-subtree-split: c48cdc4cb34451ed93bbe0c2f0c66f22cb665d23
Delete src/secp256k1 before subtree import
Merge commit '36f1c320da2471a9819d73090a2e83b09bea89b3' as 'src/secp256k1'
Always build and link libsecp256k1
Do not use EC code in global constructors
Use libsecp256k1 in key.cpp
Don't use bashisms in configure
depends: add gmp package
depends: quit exporting in config.site
build: fixup configure to not export anything
build: secp256k1 as a subdir, since it's required
revert part of 9eda1620b

This probably would've broken native OSX builds