Fix #908, set flag to speed up AS GUIs build (#930)

Every time we try to build a AS GUI, the process tries to build the objects with the flag -fvar-tracking-assignments enabled by default. The build process with this flag is never successful and the process prints a warning similar to:
"variable tracking size limit exceeded with -fvar-tracking-assignments, retrying without"
By disabling the flag in the makefile, we skip the first, always unsuccessful, attempt, saving a lot of time.

Medicina/Clients/MedicinaActiveSurfaceGUIClient/src/Makefile

@@ -18,7 +18,7 @@
 
 #
 # user definable C-compilation flags
-USER_CFLAGS = -DQT_THREAD_SUPPORT
+USER_CFLAGS = -DQT_THREAD_SUPPORT -fno-var-tracking-assignments
 
 #
 # additional include and library search paths

Noto/Clients/NotoActiveSurfaceGUIClient/src/Makefile

@@ -18,7 +18,7 @@
 
 #
 # user definable C-compilation flags
-USER_CFLAGS = -DQT_THREAD_SUPPORT
+USER_CFLAGS = -DQT_THREAD_SUPPORT -fno-var-tracking-assignments
 
 #
 # additional include and library search paths

SRT/Clients/SRTActiveSurfaceGUIClient/src/Makefile

@@ -18,7 +18,7 @@
 
 #
 # user definable C-compilation flags
-USER_CFLAGS = -DQT_THREAD_SUPPORT
+USER_CFLAGS = -DQT_THREAD_SUPPORT -fno-var-tracking-assignments
 
 #
 # additional include and library search paths