[epiphany] Enable warnings when compiling the web extension

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 4209900406ba4df4809f063475c26c9e726aa87b
Author: Michael Catanzaro <mcatanzaro igalia com>
Date:   Tue Aug 26 18:21:48 2014 -0500

    Enable warnings when compiling the web extension
    
    By accident, we don't use any compiler warnings when compiling the web
    extension. This is bad.
    
    We must either add -Wno-missing-prototypes or else declare a useless
    prototype for webkit_web_extension_initialize_with_user_data().
    
    https://bugzilla.gnome.org/show_bug.cgi?id=735491

 configure.ac                    |    2 +-
 embed/web-extension/Makefile.am |    1 +
 2 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 8955d6e..2aa9dd1 100644
--- a/configure.ac
+++ b/configure.ac
@@ -63,7 +63,7 @@ GNOME_MAINTAINER_MODE_DEFINES
 
 GNOME_CODE_COVERAGE
 
-MORE_WARN_FLAGS="-Wdeclaration-after-statement -Wno-deprecated-declarations"
+MORE_WARN_FLAGS="-Wdeclaration-after-statement -Wno-deprecated-declarations -Wno-missing-prototypes"
 
 GLIB_REQUIRED=2.38.0
 GTK_REQUIRED=3.13.0
diff --git a/embed/web-extension/Makefile.am b/embed/web-extension/Makefile.am
index 5bdb174..86b48b7 100644
--- a/embed/web-extension/Makefile.am
+++ b/embed/web-extension/Makefile.am
@@ -39,6 +39,7 @@ libephywebextension_la_CPPFLAGS = \
 libephywebextension_la_CFLAGS = \
        -DSHARE_DIR=\"$(pkgdatadir)\" \
        -DTOP_SRC_DATADIR=\"$(top_srcdir)/data\" \
+       $(AM_CFLAGS) \
        $(WEB_EXTENSION_CFLAGS)
 
 libephywebextension_la_LIBADD = \