build: avoid stdin stall with GNU AS probing.
a758c5eadded probing for various tools, such as AS. Unfortunately, GNU AS is reading stdin with -v, and thus configure is stalled with configure arguments such as --as=as. Fixes Ticket #1898. (cherry picked from commitdbb41f93c1)
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						Carl Eugen Hoyos
					
				
			
			
				
	
			
			
			
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							@@ -2878,7 +2878,9 @@ probe_cc(){
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    unset _depflags _DEPCMD _DEPFLAGS
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					    unset _depflags _DEPCMD _DEPFLAGS
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    _flags_filter=echo
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					    _flags_filter=echo
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    if $_cc -v 2>&1 | grep -q '^gcc.*LLVM'; then
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					    if $_cc --version 2>&1 | grep -q '^GNU assembler'; then
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					        true # no-op to avoid reading stdin in following checks
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					    elif $_cc -v 2>&1 | grep -q '^gcc.*LLVM'; then
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        _type=llvm_gcc
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					        _type=llvm_gcc
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        gcc_extra_ver=$(expr "$($_cc --version | head -n1)" : '.*\((.*)\)')
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					        gcc_extra_ver=$(expr "$($_cc --version | head -n1)" : '.*\((.*)\)')
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        _ident="llvm-gcc $($_cc -dumpversion) $gcc_extra_ver"
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					        _ident="llvm-gcc $($_cc -dumpversion) $gcc_extra_ver"
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