Disable library grade detection when building Mercury itself.

Library grade detection causes the library installation for the csharp grade
(and probably any grades that use mmc --make) to fail.  (There is likely
a better solution than this, e.g. making --no-mercury-stdlib-dir imply
--no-detect-libgrades, but the handling of command line options in this
part of the compiler is pretty convoluted, so I will look into that
separately.)

browser/MDB_FLAGS.in:
compiler/COMP_FLAGS.in:
deep_profiler/DEEP_FLAGS.in:
library/LIB_FLAGS.in:
mdbcomp/MDBCOMP_FLAGS.in:
mfilterjavac/MFILTERJAVAC_FLAGS.in:
profiler/PROF_FLAGS.in:
slice/SLICE_FLAGS.in:
ssdb/SSDB_FLAGS.in:
	As above.

browser/MDB_FLAGS.in

@@ -3,6 +3,7 @@
 --halt-at-warn
 --no-warn-inferred-erroneous
 --no-mercury-stdlib-dir
+--no-detect-libgrades
 --no-shlib-linker-use-install-name
 --force-disable-tracing
 --force-disable-ssdebug

compiler/COMP_FLAGS.in

@@ -3,6 +3,7 @@
 --halt-at-warn
 --no-warn-inferred-erroneous
 --no-mercury-stdlib-dir
+--no-detect-libgrades
 -I../library
 -I../browser
 -I../ssdb

deep_profiler/DEEP_FLAGS.in

@@ -3,6 +3,7 @@
 --halt-at-warn
 --no-warn-inferred-erroneous
 --no-mercury-stdlib-dir
+--no-detect-libgrades
 -I../library
 -I../browser
 -I../ssdb

library/LIB_FLAGS.in

@@ -5,6 +5,7 @@
 --halt-at-warn
 --no-warn-inferred-erroneous
 --no-mercury-stdlib-dir
+--no-detect-libgrades
 --strict-sequential 
 --generate-mmc-deps
 --no-shlib-linker-use-install-name

mdbcomp/MDBCOMP_FLAGS.in

@@ -3,6 +3,7 @@
 --halt-at-warn
 --no-warn-inferred-erroneous
 --no-mercury-stdlib-dir
+--no-detect-libgrades
 --generate-mmc-deps
 --force-disable-ssdebug
 --no-libgrade

mfilterjavac/MFILTERJAVAC_FLAGS.in

@@ -3,6 +3,7 @@
 --halt-at-warn
 --no-warn-inferred-erroneous
 --no-mercury-stdlib-dir
+--no-detect-libgrades
 -I../library
 -I../browser
 -I../ssdb

profiler/PROF_FLAGS.in

@@ -3,6 +3,7 @@
 --halt-at-warn
 --no-warn-inferred-erroneous
 --no-mercury-stdlib-dir
+--no-detect-libgrades
 -I../library
 -I../browser
 -I../mdbcomp

slice/SLICE_FLAGS.in

@@ -3,6 +3,7 @@
 --halt-at-warn
 --no-warn-inferred-erroneous
 --no-mercury-stdlib-dir
+--no-detect-libgrades
 -I../library
 -I../browser
 -I../ssdb

ssdb/SSDB_FLAGS.in

@@ -3,6 +3,7 @@
 --halt-at-warn
 --no-warn-inferred-erroneous
 --no-mercury-stdlib-dir
+--no-detect-libgrades
 --no-shlib-linker-use-install-name
 --force-disable-tracing
 --force-disable-ssdebug