Update conan profiles

Split the end user profile variants in two, e.g.:

linux-x86_64-gcc

->

  linux-x86_64-gcc  # 1
  baseprofiles/linux-x86_64-gcc  # 2

1) This is still the end user variant but this includes the
   counterpart from 3rdparty subfolder

2) This contains those settings and options that are needed
   for 3rd party depedencies like icu

Task-number: QTBUG-99213
Pick-to: 6.2 6.3
Change-Id: Ia6d7d9c5759848ff339cf8f50a40b10dfd9877d6
Reviewed-by: Simo Fält <simo.falt@qt.io>

coin/conan/profiles/baseprofiles/linux-x86_64-gcc-debug-developer

@@ -0,0 +1,9 @@
+[settings]
+    os=Linux
+    arch=x86_64
+    compiler=gcc
+    compiler.version=9.3
+    compiler.libcxx=libstdc++11
+    build_type=Debug
+[options]
+*:shared=True