[Patch-gnuradio] Fix configure SDCC check to use provided XCC

[Michael Dickens]

In config/usrp_sdcc.m4, if the variables XCC and XAS are both set/found, then 
the SDCC version is checked via:

sdcc_version=`sdcc --version 2>&1 | \
                        sed  's/\(SDCC.* \)\([[0-9]]*\.[[0-9]]*\.[[0-9]]*\)\( 
.*$\)/\2/'`

which will not work if 'sdcc' is not in the current / usual path -- e.g., if 
XCC or XAS is set by the user.  This patch provides 'configure --help' for 
those variables, as well as corrects the above line for retrieving SDCC's 
version.  This diff is off if the current master, using 'git diff'. - MLD

patch_config_usrp_sdcc.m4.diff
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