Add package libwebp

See #442 and #445.

Signed-off-by: Timothy Gu <timothygu99@gmail.com>

index.html

@@ -1781,6 +1781,10 @@ local-pkg-list: $(LOCAL_PKG_LIST)</pre>
         <td class="package">libvpx</td>
         <td class="website"><a href="http://code.google.com/p/webm/">vpx</a></td>
     </tr>
+    <tr>
+        <td class="package">libwebp</td>
+        <td class="website"><a href="https://developers.google.com/speed/webp/">libwebp</a></td>
+    </tr>
     <tr>
         <td class="package">libwebsockets</td>
         <td class="website"><a href="http://libwebsockets.org/">libwebsockets</a></td>

src/libwebp.mk

@@ -0,0 +1,24 @@
+# This file is part of MXE.
+# See index.html for further information.
+
+PKG             := libwebp
+$(PKG)_IGNORE   :=
+$(PKG)_VERSION  := 0.4.1
+$(PKG)_CHECKSUM := 6d3a8a0c25ec4e2eb7a04d9e7f52d780a9d6c0ed
+$(PKG)_SUBDIR   := $(PKG)-$($(PKG)_VERSION)
+$(PKG)_FILE     := $(PKG)-$($(PKG)_VERSION).tar.gz
+$(PKG)_URL      := http://downloads.webmproject.org/releases/webp/$($(PKG)_FILE)
+$(PKG)_DEPS     := gcc
+
+define $(PKG)_UPDATE
+    $(WGET) -q -O- 'https://developers.google.com/speed/webp/download' | \
+    $(SED) -n 's,.*<a href="http://downloads.webmproject.org/releases/webp/libwebp-\([0-9][^"]*\)\.tar.gz">Download</a> |,\1,p' | \
+    $(SORT) -V | \
+    tail -1
+endef
+
+define $(PKG)_BUILD
+    cd '$(1)' && ./configure \
+        $(MXE_CONFIGURE_OPTS)
+    $(MAKE) -C '$(1)' -j '$(JOBS)' install bin_PROGRAMS= sbin_PROGRAMS= noinst_PROGRAMS= man_MANS=
+endef