use https for more downloads

Let's use https instead of http wherever possible.

For speex/speexdsp this is essential because they where using neither
https nor checksums.
For other pages it avoids unnecessary redirects hen they eventually end
up on a https url anyway.`

Change-Id: Ic07d74480b5a3f5adcf4db17b1bacd51b6aa4439

contrib/src/flac/rules.mak

 # FLAC
 
 FLAC_VERSION := 1.3.0
-FLAC_URL := http://downloads.xiph.org/releases/flac/flac-$(FLAC_VERSION).tar.xz
+FLAC_URL := https://downloads.xiph.org/releases/flac/flac-$(FLAC_VERSION).tar.xz
 
 PKGS += flac
 ifeq ($(call need_pkg,"flac"),)

contrib/src/main.mak

@@ -37,9 +37,9 @@ VPATH := $(TARBALLS)
 BATCH_MODE = 1
 
 # Common download locations
-GNU := http://ftpmirror.gnu.org/
+GNU := https://ftpmirror.gnu.org/
 SF := https://sourceforge.net/projects
-CONTRIB_VIDEOLAN ?= http://downloads.videolan.org/pub/contrib
+CONTRIB_VIDEOLAN ?= https://downloads.videolan.org/pub/contrib
 
 #
 # Machine-dependent variables

contrib/src/ogg/rules.mak

@@ -2,7 +2,7 @@
 
 OGG_VERSION := 1.3.1
 
-OGG_URL := http://downloads.xiph.org/releases/ogg/libogg-$(OGG_VERSION).tar.xz
+OGG_URL := https://downloads.xiph.org/releases/ogg/libogg-$(OGG_VERSION).tar.xz
 #OGG_URL := $(CONTRIB_VIDEOLAN)/libogg-$(OGG_VERSION).tar.xz
 
 PKGS += ogg

contrib/src/speex/rules.mak

 # speex
 
 SPEEX_HASH := 9172c7ef85fbf058027528d48ededbc7ca847908
-SPEEX_GITURL := http://git.xiph.org/?p=speex.git;a=snapshot;h=$(SPEEX_HASH);sf=tgz
+SPEEX_GITURL := https://git.xiph.org/?p=speex.git;a=snapshot;h=$(SPEEX_HASH);sf=tgz
 
 PKGS += speex
 ifeq ($(call need_pkg,"speex >= 1.0.5"),)

contrib/src/speexdsp/rules.mak

 # speexdsp
 
 SPEEXDSP_HASH := 83b63852e0e4755a8c04a1f9c87dd73b5aa6293f
-SPEEXDSP_GITURL := http://git.xiph.org/?p=speexdsp.git;a=snapshot;h=$(SPEEXDSP_HASH);sf=tgz
+SPEEXDSP_GITURL := https://git.xiph.org/?p=speexdsp.git;a=snapshot;h=$(SPEEXDSP_HASH);sf=tgz
 
 PKGS += speexdsp
 ifeq ($(call need_pkg,"speexdsp"),)

contrib/src/vorbis/rules.mak

 # libvorbis
 
 VORBIS_VERSION := 1.3.4
-VORBIS_URL := http://downloads.xiph.org/releases/vorbis/libvorbis-$(VORBIS_VERSION).tar.xz
+VORBIS_URL := https://downloads.xiph.org/releases/vorbis/libvorbis-$(VORBIS_VERSION).tar.xz
 #VORBIS_URL := $(CONTRIB_VIDEOLAN)/libvorbis-$(VORBIS_VERSION).tar.gz
 
 ifdef HAVE_FPU

extras/tools/packages.mak

-GNU=http://ftp.gnu.org/gnu
+GNU=https://ftp.gnu.org/gnu
 APACHE=http://mir2.ovh.net/ftp.apache.org/dist
-SF= http://downloads.sourceforge.net/project
+SF= https://downloads.sourceforge.net/project
 
 YASM_VERSION=1.2.0
 #YASM_URL=$(CONTRIB_VIDEOLAN)/yasm-$(YASM_VERSION).tar.gz
-YASM_URL=http://www.tortall.net/projects/yasm/releases/yasm-$(YASM_VERSION).tar.gz
+YASM_URL=https://www.tortall.net/projects/yasm/releases/yasm-$(YASM_VERSION).tar.gz
 
 CMAKE_VERSION=3.2.2
-CMAKE_URL=http://www.cmake.org/files/v3.2/cmake-$(CMAKE_VERSION).tar.gz
+CMAKE_URL=https://www.cmake.org/files/v3.2/cmake-$(CMAKE_VERSION).tar.gz
 
 LIBTOOL_VERSION=2.4.6
 LIBTOOL_URL=$(GNU)/libtool/libtool-$(LIBTOOL_VERSION).tar.xz
@@ -29,7 +29,7 @@ TAR_VERSION=1.28
 TAR_URL=$(GNU)/tar/tar-$(TAR_VERSION).tar.bz2
 
 XZ_VERSION=5.2.2
-XZ_URL=http://tukaani.org/xz/xz-$(XZ_VERSION).tar.bz2
+XZ_URL=https://tukaani.org/xz/xz-$(XZ_VERSION).tar.bz2
 
 GAS_VERSION=36bacb4cba27003c572e5bf7a9c4dfe3c9a8d40d
 GAS_URL=https://raw.githubusercontent.com/FFmpeg/gas-preprocessor/$(GAS_VERSION)/gas-preprocessor.pl