Merge master into closure-size

The kde-5 stuff still didn't merge well.
I hand-fixed what I saw, but there may be more problems.

pkgs/stdenv/generic/setup.sh

@@ -189,6 +189,17 @@ _addRpathPrefix() {
     fi
 }
 
+# Return success if the specified file is an ELF object.
+isELF() {
+    local fn="$1"
+    local magic
+    exec {fd}< "$fn"
+    read -n 4 -u $fd magic
+    exec {fd}<&-
+    if [[ "$magic" =~ ELF ]]; then return 0; else return 1; fi
+}
+
+
 ######################################################################
 # Initialisation.
 
@@ -371,6 +382,13 @@ export NIX_BUILD_CORES
 paxmark() { true; }
 
 
+# Prevent OpenSSL-based applications from using certificates in
+# /etc/ssl.
+if [ -z "$SSL_CERT_FILE" ]; then
+  export SSL_CERT_FILE=/no-cert-file.crt
+fi
+
+
 ######################################################################
 # Textual substitution functions.
 
@@ -639,14 +657,14 @@ configurePhase() {
 
     # Add --disable-dependency-tracking to speed up some builds.
     if [ -z "$dontAddDisableDepTrack" ]; then
-        if grep -q dependency-tracking $configureScript; then
+        if grep -q dependency-tracking "$configureScript"; then
             configureFlags="--disable-dependency-tracking $configureFlags"
         fi
     fi
 
     # By default, disable static builds.
     if [ -z "$dontDisableStatic" ]; then
-        if grep -q enable-static $configureScript; then
+        if grep -q enable-static "$configureScript"; then
             configureFlags="--disable-static $configureFlags"
         fi
     fi