libc/uClibc: portability fixes to install_headers

Add patch files for uClibc-0.9.30:
extra/scripts/install_headers.sh: find must be called with path.
extra/scripts/unifdef.c: getline is declared in <stdio.h>, use different name.

Reported-by: "Guylhem Aznar" <crossgcc@guylhem.net>
Reported-by: "Titus von Boxberg" <titus@v9g.de>
Signed-off-by: "Titus von Boxberg" <titus@v9g.de>
(transplanted from b745004e1d29921a86b73694d912f1e1277db3e1)

 # Default test suite configuration

 # Default DejaGnu configuration

 DG_TOOLNAME = gcc

 DG_TARGET_HOSTNAME = 127.0.0.1

 DG_TARGET_USERNAME = root

 # Default tests

 DG_C_TESTS = 

 DG_CPP_TESTS =