Rename “OS X” to the newer “macOS” convention

depends/README.md

@@ -22,7 +22,7 @@ Common `host-platform-triplets` for cross compilation are:
 
 - `i686-w64-mingw32` for Win32
 - `x86_64-w64-mingw32` for Win64
-- `x86_64-apple-darwin11` for MacOSX
+- `x86_64-apple-darwin11` for macOS
 - `arm-linux-gnueabihf` for Linux ARM 32 bit
 - `aarch64-linux-gnu` for Linux ARM 64 bit
 
@@ -49,7 +49,7 @@ The following can be set when running make: make FOO=bar
 
     SOURCES_PATH: downloaded sources will be placed here
     BASE_CACHE: built packages will be placed here
-    SDK_PATH: Path where sdk's can be found (used by OSX)
+    SDK_PATH: Path where sdk's can be found (used by macOS)
     FALLBACK_DOWNLOAD_PATH: If a source file can't be fetched, try here before giving up
     NO_QT: Don't download/build/cache qt and its dependencies
     NO_WALLET: Don't download/build/cache libs needed to enable the wallet
@@ -64,7 +64,7 @@ options will be passed to bitcoin's configure. In this case, `--disable-wallet`.
 Additional targets:
 
     download: run 'make download' to fetch all sources without building them
-    download-osx: run 'make download-osx' to fetch all sources needed for osx builds
+    download-osx: run 'make download-osx' to fetch all sources needed for macOS builds
     download-win: run 'make download-win' to fetch all sources needed for win builds
     download-linux: run 'make download-linux' to fetch all sources needed for linux builds
 

depends/description.md

@@ -7,7 +7,7 @@ In theory, binaries for any target OS/architecture can be created, from a
 builder running any OS/architecture. In practice, build-side tools must be
 specified when the defaults don't fit, and packages must be amended to work
 on new hosts. For now, a build architecture of x86_64 is assumed, either on
-Linux or OSX.
+Linux or macOS.
 
 ### No reliance on timestamps