Allow multi-word "install" command.

Autoconf can determine that the correct install command includes flags,
e.g., "/usr/bin/install -c". When using this as a command, we can't
enclose the value in double-quotes, as that makes some shells use the
whole expression as a filename:

# this is the value returned by autoconf and stored in CT_install
$ ins="/usr/bin/install -c"

# if we call it with quotes, the command is not found
$ "${ins}"
bash: /usr/bin/install -c: No such file or directory

# removing the quotes lets it work as expected
$ ${ins}
/usr/bin/install: missing file operand
Try `/usr/bin/install --help' for more information.

Signed-Off-By: Anthony Foiani <anthony.foiani@gmail.com>

 This patch is courtesy of OpenEmbedded, by Khem Raj <raj.khem@gmail.com>

 http://cgit.openembedded.org/cgit.cgi/openembedded/commit/?id=b85b779688f0abc389e3c25d06b54de8b86385c1

 Index: ltrace-0.5.3/sysdeps/linux-gnu/mipsel/trace.c

 ===================================================================

 --- ltrace-0.5.3.orig/sysdeps/linux-gnu/mipsel/trace.c	2009-10-23 23:15:59.822783128 -0700

 +++ ltrace-0.5.3/sysdeps/linux-gnu/mipsel/trace.c	2009-10-23 23:16:10.441268788 -0700

 @@ -127,7 +127,6 @@ gimme_arg(enum tof type, Process *proc, 

  			return ret;

  		} else {

  			// If we need this, I think we can look at [sp+16] for arg_num==4.

 -			CP;

  			return 0;

  		}

  	}