configure: document 'compiler_num' for gcc #5069
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The CURL_CHECK_COMPILER_GNU_C function sets the number to MAJOR*100 + MINOR and ignores the patch version, and since gcc version 7 it only sets it to MAJOR*100. Reported-by: Stepan Efremov Ref: #5067
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The CURL_CHECK_COMPILER_GNU_C function sets the number to MAJOR100 +
MINOR and ignores the patch version, and since gcc version 7 it only
sets it to MAJOR100.
Reported-by: Stepan Efremov
Ref: #5067