Remove gmp dependency and doc mentions

Author: sipa

depends/packages/gmp.mk

@@ -1,4 +1,4 @@
-packages:=boost openssl gmp
+packages:=boost openssl
 native_packages := native_ccache native_comparisontool
 
 qt_native_packages = native_protobuf

depends/packages/packages.mk

@@ -38,7 +38,7 @@ Instructions: Homebrew
 
 #### Install dependencies using Homebrew
 
-        brew install autoconf automake libtool boost miniupnpc openssl pkg-config protobuf qt gmp
+        brew install autoconf automake libtool boost miniupnpc openssl pkg-config protobuf qt
 
 #### Installing berkeley-db4 using Homebrew
 

depends/patches/gmp/arm_gmp_build_fix.patch

@@ -33,7 +33,6 @@ These dependencies are required:
  ------------|------------------|----------------------
  libssl      | SSL Support      | Secure communications
  libboost    | Boost            | C++ Library
- libgmp      | secp256k1        | Arbitrary-precision arithmetic (version >= 3.1)
 
 Optional dependencies:
 
@@ -58,7 +57,7 @@ Dependency Build Instructions: Ubuntu & Debian
 ----------------------------------------------
 Build requirements:
 
-	sudo apt-get install build-essential libtool autotools-dev autoconf pkg-config libssl-dev libgmp-dev
+	sudo apt-get install build-essential libtool autotools-dev autoconf pkg-config libssl-dev
 
 for Ubuntu 12.04 and later or Debian 7 and later libboost-all-dev has to be installed: