* lib/compiler.c: Add hp_cc_compiler and hp_aCC_compiler.
* lib/compiler.cc: Likewise.
* lib/gdb.exp (get_compiler_info): Always call gdb_compile to
get the right preprocessor. Eval the output directly. Remove
special tests for hp_cc_compiler and hp_aCC_compiler. Remove
hp_f77_compiler and hp_f90_compiler completely.
(gdb_preprocess): Delete.
(get_compiler): Delete.
* lib/gdb.exp (compiler_info): New global.
(test_compiler_info): New function.
(get_compiler_info): Set compiler_info.
* lib/compiler.c, lib/compiler.cc: Add copyright. When GNUC, set
"compiler_info" to gcc-<major>-<minor>.
