Testing: Update hard-coded line numbers to [0-9]+ in some tests

...s/RunCMake/CMP0026/CMP0026-CONFIG-LOCATION-NEW-stderr.txt

...s/RunCMake/CMP0026/CMP0026-CONFIG-LOCATION-OLD-stderr.txt

.../RunCMake/CMP0026/CMP0026-CONFIG-LOCATION-WARN-stderr.txt

...s/RunCMake/CMP0026/CMP0026-LOCATION-CONFIG-NEW-stderr.txt

...s/RunCMake/CMP0026/CMP0026-LOCATION-CONFIG-OLD-stderr.txt

.../RunCMake/CMP0026/CMP0026-LOCATION-CONFIG-WARN-stderr.txt

Tests/RunCMake/CMP0026/CMP0026-NEW-stderr.txt

Tests/RunCMake/CMP0026/CMP0026-OLD-stderr.txt

Tests/RunCMake/CMP0026/CMP0026-WARN-stderr.txt

...s/RunCMake/CMP0026/LOCATION-and-TARGET_OBJECTS-stderr.txt

Tests/RunCMake/CMP0026/ObjlibNotDefined-stderr.txt

Tests/RunCMake/CMP0026/clear-cached-information-stderr.txt

Tests/RunCMake/CMP0051/CMP0051-OLD-stderr.txt

Tests/RunCMake/CMP0051/CMP0051-WARN-stderr.txt

Tests/RunCMake/CommandLine/Wdeprecated-stderr.txt

Tests/RunCMake/CommandLine/Wdev-stderr.txt

Tests/RunCMake/CommandLine/Werror_deprecated-stderr.txt

Tests/RunCMake/CommandLine/Werror_dev-stderr.txt

Tests/RunCMake/CommandLine/Wno-error_deprecated-stderr.txt

Tests/RunCMake/CommandLine/Wno-error_dev-stderr.txt