depends: add MULTIPROCESS depends option

Builds required packages and passes --enable-multiprocess option to bitcoin build

depends/hosts/android.mk

@@ -9,3 +9,4 @@ android_CXX=$(ANDROID_TOOLCHAIN_BIN)/$(HOST)$(ANDROID_API_LEVEL)-clang++
 android_CC=$(ANDROID_TOOLCHAIN_BIN)/$(HOST)$(ANDROID_API_LEVEL)-clang
 android_RANLIB=$(ANDROID_TOOLCHAIN_BIN)/$(HOST)-ranlib
 endif
+android_cmake_system=Android

depends/hosts/darwin.mk

@@ -14,3 +14,4 @@ darwin_debug_CFLAGS=-O1
 darwin_debug_CXXFLAGS=$(darwin_debug_CFLAGS)
 
 darwin_native_toolchain=native_cctools
+darwin_cmake_system=Darwin

depends/hosts/linux.mk

@@ -29,3 +29,4 @@ i686_linux_CXX=$(default_host_CXX) -m32
 x86_64_linux_CC=$(default_host_CC) -m64
 x86_64_linux_CXX=$(default_host_CXX) -m64
 endif
+linux_cmake_system=Linux

depends/hosts/mingw32.mk

@@ -8,3 +8,5 @@ mingw32_debug_CFLAGS=-O1
 mingw32_debug_CXXFLAGS=$(mingw32_debug_CFLAGS)
 
 mingw32_debug_CPPFLAGS=-D_GLIBCXX_DEBUG -D_GLIBCXX_DEBUG_PEDANTIC
+
+mingw_cmake_system=Windows