examples: Remove workaround for RTX crash

This reverts commit 3413cbb9.

Platform files for GNU ASM missed floating point flags, causing CMSIS
RTX's SVC handlers (written in assembly files) to incorrectly determine
stack frame sizes when floating point is used, resulting in memory
corruption when switching between threads. Because of this, we had to
work around this by using newlib-nano instead of the full newlib to
avoid floating point usage in libc in a few examples, but newlib-nano
has reduced functionality and is not designed to be thread-safe.

Having fixed the floating point flags in the toolchain repository, we
now remove the workaround.

Signed-off-by: Lingkai Dong <lingkai.dong@arm.com>

templates/examples/aws-client/CMakeLists.txt.in

@@ -66,11 +66,6 @@ include(CTest)
 add_subdirectory(configs)
 add_subdirectory(aws-credentials)
 
-target_link_options(cmsis-core
-    INTERFACE
-        $<$<STREQUAL:${CMAKE_C_COMPILER_ID},GNU>:--specs=nano.specs>
-)
-
 # Add user application
 add_executable(iotsdk-example-aws-client main.c)
 

templates/examples/azure-sdk/CMakeLists.txt.in

@@ -69,11 +69,6 @@ include(CTest)
 # because a project may want to provide its own device header.
 target_compile_definitions(cmsis-core INTERFACE CMSIS_device_header="@CMSIS_device_header@")
 
-target_link_options(cmsis-core
-    INTERFACE
-        $<$<STREQUAL:${CMAKE_C_COMPILER_ID},GNU>:--specs=nano.specs>
-)
-
 # Add RTOS configuration headers
 @RTOS_HEADER_INCLUDE@
 

templates/examples/mbedtls/CMakeLists.txt.in

@@ -67,11 +67,6 @@ include(CTest)
 # because a project may want to provide its own device header.
 target_compile_definitions(cmsis-core INTERFACE CMSIS_device_header="@CMSIS_device_header@")
 
-target_link_options(cmsis-core
-    INTERFACE
-        $<$<STREQUAL:${CMAKE_C_COMPILER_ID},GNU>:--specs=nano.specs>
-)
-
 # Add RTOS configuration headers
 @RTOS_HEADER_INCLUDE@