install: Do not install license and pkgconfig files as executable

This is very similar to the problem with headers, except that in this case,
the variables for installation override were missing.

Signed-off-by: Christophe de Dinechin <christophe@dinechin.org>

NEWS

@@ -1,7 +1,7 @@
 v0.3.1          Release v0.3.1: Configure variable name changes
 
     - Rename 'configure' arguments as `CONFIGURE.foo` instead of `IGNORED_FOO`
-    - Do not install headers with executable flag
+    - Do not install headers, pkgconfig or license with executable flag
 
 v0.3.0          Release 0.3.0: Variable name changes
 

config.gnu.mk

@@ -55,6 +55,8 @@ INSTALL.lib=	$(INSTALL)
 INSTALL.man=	$(INSTALL.data)
 INSTALL.doc=	$(INSTALL.data)
 INSTALL.etc=	$(INSTALL.data)
+INSTALL.pkgconfig=$(INSTALL.data)
+INSTALL.license=$(INSTALL.data)
 UNINSTALL=	/bin/rm -f
 UNINSTALL.dir=	/bin/rmdir > /dev/null 2>&1
 UNINSTALL.ok=	|| true