Bug 4893

Even though libiconv v1.8 is installed and available in /usr/local/lib,
fontconfig refuses to recognize that the libraries are available when using GNU
ld.  It also uses improper arguments when using Sun ld, thus killing the make.

The configure script does recognize libiconv as shown below.

.
. 
checking for iconv... yes
checking for freetype-config... /usr/local/bin/freetype-config
.
.

However, the actual compile fails once it reaches the fc-cache section.  When
using GNU ld:

bash-2.05# make
.
.
make[2]: Entering directory `/tmp/fontconfig-2.3.2/fc-cache'
/bin/bash ../libtool --mode=link gcc  -mcpu=v9   -o fc-cache  fc-cache.o
../src/libfontconfig.la 
gcc -mcpu=v9 -o .libs/fc-cache fc-cache.o  ../src/.libs/libfontconfig.so
-L/usr/local/lib /usr/local/lib/libfreetype.so -lz /usr/local/lib/libexpat.so
-Wl,--rpath -Wl,/usr/local/lib
../src/.libs/libfontconfig.so: undefined reference to `libiconv_open'
../src/.libs/libfontconfig.so: undefined reference to `libiconv_close'
../src/.libs/libfontconfig.so: undefined reference to `libiconv'
collect2: ld returned 1 exit status
make[2]: *** [fc-cache] Error 1
make[2]: Leaving directory `/tmp/fontconfig-2.3.2/fc-cache'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/tmp/fontconfig-2.3.2'
make: *** [all] Error 2

When using Sun ld, the make errors out because of invalid arguments, even though
configure recognized that the ld is not a GNU ld.